Engine builders opinions pls.

[1BAD89]

Scat steel crank

Isn't that crank only rated up to 450-500hp? They say it's a good crank for around 450. The other day when you posted, you said you had an 850 Barry grant carb, and 10.5:1 CR. Why the changes all of a sudden? I would really question how long your motor would hold up to a 2 stage 200/250 shot.

what head would best suite my application, ( Very limited street use)

If our running very limited street use, bump the compression ratio up, maybe 12:1, 12.5:1, but that means 110. So it's up to you , it's all in how much money you want to spend on the heads and gas money... But why switch heads? Your running 431rwhp Naturally aspirated with a 347!!! And then your going to run a 200 shot+ 2 stage?, That will put you at 630+rwhp. Do you already have a Tremec and new clutch on the way? What about your rear-end, what kind of set up are you running back there? It's toast if it's stock. Have your 10-point cage in yet? With that much hp, unless you have all the top of the line parts, stuff is going to break rapidly. If your still running your T-5, forget it, it's going to cut your ankles off when it explodes in 8,000,000 pieces. Have you ran it at the track yet, and if so what did it run? I'd say your getting a little bit greedy with the hp , 431rwp is great on a N/A 347. What if you spent $2000 on heads and picked up 2hp, or even lost hp? If you haven't ran it at the track, I'd suggest you do that, before you tear down your motor, or switch heads.