Join Date: Jan 2004
Location: Winston Salem, NC
Re: SBC 400 build
2-bolt 400s are stronger than 4-bolt so go that route for sure. If you get a good 400 block they can take a pounding. I would not build a 434 with a factory block though.
My thoughts are, if you have a 383 already spend some money on it. Get some head work done (or a new set), cam, intake, whatever. It will be a bunch cheaper than building a 400 from scratch.
A good converter can pick you up as much as a good set of heads some times....
69 Camaro, 3650lbs., 400ci, TH400, Coan 10" converter, 3.50 gear
D1SC, pump gas, street car, Water/Meth injection
1.302 60', 5.956 @ 116.4 Super Sniper EFI 2019