Wow, can't wait for an answer huh? Not even 40 minutes. Yikes!
400 HP at best IMO
Is it 10-1 or 11-1 comp ratio?
The starter, hardened valve "seats" fuel pump & crank material have nothing to do with making HP. Just a FYI. ;)
Glass packs, if they neck down in the inside, rob HP. Better parts are required. Flex fan is not helping. Better off with the factory viscous fan dyno proven to make more power over flex fans.
I think a bowl ported set of heads would do you right.
I've been building engines since the 70s. Just wanted to see what some other motor guys think. And 400hp I can get with a mild cam intake and carb. And no head work. I added the glass packs and starter ect because it was a bud of mines build. He's getting it dynoed and just wanted some predictions. Sock x heads flowed about 220cfm so I agree 250 would help reach the mark.
Could be 325 to 350,with stock heads safely said,glass packs work,but doesn't help the horsepower situation. 250 cfm intake flow,& even 1 5/8" primary tube headers,400-420 h.p. should be easy with a good short block zero decked.
This article was written in 2001 but they took a bone stock 1970 340 and added some goodies one at a time. They wound up with 355 HP from just bolt on goodies. Made over 400 with a cam change. Impressive!