A 350cfm carb would put you right where you need to be. On PAPER a 292 at 4000rpm would pump 338cfm. With that intake have you considered using a self tuning TBI? We don't use carburetors anymore and everyone has been very satisfied with the result. An O2 bung in the exhaust, high pressure fuel pump, and very simple wiring is required. Zero hot-cold starting problem and MUCH better economy.
Thanks for the idea. Those setups are way to much money for me right now. :/ I was reading one of the sponsor sites that suggested 500cfm so I thought I would be safe with a holley , and 390+ cfm.. until I started to look into it up myself.. and for driveability the lower cfm was looking better..
The Aussiespeed intake I bought actually says use holley 390+ to fit.. So I guess I will have to get some sort of adapter for a 350 or the carter 400 you guys are mentioning.
Aussiespeed Chevy 250, 292 Chevrolet in line 6 cylinder 4 barrel intake manifold, this performance inlet manifold offers high velocity ports, divided center plenum port allowing for even flow to all runners. the Aussiespeed Chevy 6 inline manifold is available in to suit square bore Holley 4 barrel carbs the manifold is supplied to accept either forward facing or sideways mounting carburetors.
230 250 292 Chevrolet Premium intake manifold only.
No Adapter is required to mount a single 4 barrel.
The intake manifold comes drilled for both positions forwards and sideways mounting of a 4150 style 4 barrel square bore
Holley Carburetor from 390 CFM to 850 CFM
