[Chief]

Just attach a short length of vacuum hose to the EGR valve and shove a screw in the end of the hose...the EGR valve will remain closed, as it does under full-throttle conditions where there's no vacuum to open it.
If you want it to look neat, you can get a block-off plate from your dealer (or a junkyard manifold) and eliminate the valve altogether. These were factory-installed on non-EGR engines, back when the other 49 states didn't require EGR. Cheaper than tooling for two different manifolds.
That line to the canister won't effect your performance. It's a vapor recovery system designed to keep gas fumes from your carburetor and fuel tank from leaking into the atmosphere. If you don't like the clutter, just block the lines off and throw all that shit away.

[Chief]

I'd leave the PCV hooked up if it were mine, K. It's not robbing any horsepower, and it will release internal pressure built up by windage from the rotating assembly as well as keep things tidy (hides all that blowby )
No prob with the canister. Plug it, or chunk it.

[WRENCH47]

It's not a good practice to plug EGR valves on fuel injected engines.The main purpose
of the EGR is to use exhaust gasses to cool the combustion process during lean running
cycles (such as cruising) to prevent detonation (pinging),although high octane fuel will
help.The EGR will usually be closed under full throttle anyway,thus not affecting performance.
It's also a bad idea to pump fresh air into an engine crankcase,unless you want to blow
every seal out of the engine.A PCV valves job is to evacuate the crankcase of ANY
pressure in the engine.Pressure buildup in the crankcase can be the cause of many
serious woes ,mainly oil being pushed up past the oil control rings, or past the valve
seals and down the valve guides.
By the way, it is combustion pressure, acting on a chamfered inner area of the piston
ring, that helps seal the rings against the cyl. wall from the top,not fresh air from the bottom.
Hope this helps you out.

Wrench

[JT]

Damn Gearheads!....did somebody mention blow by?....

You have to leave the PCV there if you remove it an plug the valve covers it will blow every seal and gasket in the motor. Even if that 7.5:1 Big block has a little blow by there is nothing like a RAT. You can remove all the lines from the charcoal canister and plug all but the one to to the tank if you get a breather valve for a Differential you can put it on the line and then just run it to the outside of the inner fender, you will smell gas occasionally but it is better then having a plastic container filled with gas fumes eh. The EGR is steel if you have a welder and a griner you can make your own plug out of the base of the EGR just paint it and it will look pretty. If the bullshitbullshitbullshitbullshitbullshitbullshitpu ke is the origional Ca equipped Carb you can't change the idle mixture circuit I would scrap it for the 750 plus it is probably only a 575 Cfm Carb. You will wan't to re-jet that AFB because they are way ritch out of the box go two sizes smaller and it will run tons better. The reason that the Q-jet has better bottom end is the size of the Primaries, by being small they cause the air to accellerate through the smaller bores which in turn produces more torque (proportionally to a larger primary bore carb). Qjets are problematic at best, I hate 'em. Rebuilding that 750 with Edelbrock parts only costs about $45 and the better part of an hour and it can be smokin'. if you wan't real power go to a holley carb. Or the ultimate would be a 671 blower, you would have to change the cam but with that compression ration it would be just fine just boltin' it up. I have a 427 oval prot runs 625 HP 885 w/ 200 shot, Like I said can't beat a rat.