when considering the throttle body swap, take into consideration that the Ramjet 502 uses the same throttle obdy as a stock LT1, and they put out over 500 horses. a small block making 500 horses moves the same amount of air as a big block making 500 horses, so the stock throttle body should definiteley be good enough for what you are doing. anything you can do to get more filtered air to the throttle body will help a lot- on my LT1 powered 94 Caprice, just hacking a bunch of holes in the stock air box made a very noticable difference in the way the car ran.
and why, exactly, do you have 2" primary headers? that's healthy big block territory there.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?