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Change the carb to the quadtrjet. Put a 2" exhaust system with no X or H pipe. Use a pair a Dynomax Super Turbos.

Keep the rear end, it will work perfectly with the TH400.

You want an engine that runs on 87 octane. Keep the compression at 8.5 to 9. One thing the seventies taught us was running compression in the 10s 0r 11s isn't needed for very strong street performance. Keep the ports on the heads as close to stock as possible for good velocity.

Don't make the age-old mistake of using drag racing components on a street car. They are two completely different things. The Pontiac 068 cam is an excellent street cam so is the Summit 2801. You want bottom end power. This and the 2.56 rear end really works well with a street converter and will get the stator multiplying tork...

I remember this one article they did back in the eighties. They took a stock Pontiac 400 from a 1974 station wagon in a junk yard and put it in a 65 Le Mans. Replaced the points, cap, rotor and wires. Cleaned up the Quadrajet, Put some cheap 10W30 oil with a new filter in it and off they went to the drags. They got the lemans into very low 12s. They said with a little more screwdriver tuning they could of been into the 11s with ease.