a good suggestion for the carb size.
Sadly most people go way to big on their carb selection...like trying to flush a toilet thru a straw... for maximum torque you are better off with a smaller carb, increased vacuum and higher intake velocity..
you can substitute your engine cu.in into these formulas and get a good idea what you need for max carb cfm
Engine size 302cu.in. divided by 2 = 151 cu.in / per crank revolution
if you figure 90% volumetric efficiency
"85% is more realistic for a 2 valve engine"
it would = 151cu.in.*.9 = 135.9 cu. in./ per revolution
max rpm will say 6,000 rpm "YeeHaa"
6000rpm * 135.9 cu.in. = 815400 Cu.in. / per minute
1 Cu.Ft. = 12"*12"*12" = 1728 cu.in.
815400 cu.in./minute divided by 1728 cu.in. = 384.49 CFM
add 30% so Carb is flowing at 70% of it's max at your Max RPM
384.49 *1.30= 499.383 CFM = 500CFM
So 500 cfm "air flow capability is all you need" this will give you the max flow you need....
once you get it up and running then you need to tune the carb to your engines needs...This is where the Power come from
ie accelerator pump, power valve and vac secondary adjust if applicable... if your interested I can give you the procedure I use for the tuning..
hope this helps
Steamdonkey
efficiency 151cu.in. * .8 = 120.8 cu.in.
max rpm 5500 rpm 5500*120.8= 664,400 cu.in / min
1728 cu. in. = 1 cu ft 664400/1728 =