Chevy put all this together (turn key), and I have been real happy with it. I don't really plan to change anything, it just seems to me that a vacuum secondary carb gives you small when you want it, and big when you need it! Just for information, here's the specs according to Chevy:
Cam 208intake/221exhaust (intake lift .474, exhaust lift .510)
58cc aluminum heads
1.94 intake valves / 1.50 exhaust valves
hydraulic roller cam
dual plane intake
355hp / 405 tq
I have a 700-R4 and a ford 9-inch 3.50 gears.
28" tall rear tire. 70 mph is just over 2000rpm in o/d.