FYI - This bored out 46mm Throttle Body flows 650 CFM which will support a 350 turning up to 6,000RPM. I'm running this with an 18LB spring set to 20LBs
https://www.ebay.com/itm/46mm-PORTE...837306?hash=item3d963196ba:g:mpwAAOSw2xRYWVJj
And these heads flow better than the Vortec ones.
https://www.summitracing.com/parts/sum-162108/make/chevrolet
https://www.ebay.com/itm/46mm-PORTE...837306?hash=item3d963196ba:g:mpwAAOSw2xRYWVJj
And these heads flow better than the Vortec ones.
https://www.summitracing.com/parts/sum-162108/make/chevrolet