carb size

[SS Shaun]

ok so now that i know what distributor i am going to order now i need to know what carb i should run. I am running a 454 in my chevelle its mostly stock. here is the cam spec

Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,700-5,200
Intake Duration at 050 inch Lift 218
Exhaust Duration at 050 inch Lift 228
Duration at 050 inch Lift 218 int./228 exh.
Advertised Intake Duration 276
Advertised Exhaust Duration 286
Advertised Duration 276 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.500 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.500 in.
Valve Lift with Factory Rocker Arm Ratio 0.500 int./0.500 exh.
Lobe Separation (degrees) 114

rockers are a 1.7

the motor is stock compression not sure which motor it is as far as what 454 but my pistons look like this
(not my pistons just found a random pic on the net but those look exactly like my pistons) i was told i needed an 850 with mechanical secondaries i think that is a bit much for a car that is pretty much never going to see about 4000 rpms and never see a drag strip with this motor and trans setup. so what do you guys think? 670 vacuum secondaries? 750 vacuum secondaries? help me figure this out