If that carb flows that much cfm its to big for your combo. Total advance also is a little high for my taste and would double check cam timing. As for the intake it would be like the valve body no way I would change it untill I was happy with the way it ran.
We had a 383 std bore that ran that same intake with a 750 dp, trw 284/484 and 3.91 gears went 7.90's. Daily driver in a hevier 73 duster. Its their you have to find it. Good luck.