496 stroker stealth heads

We built one last weekend although not that big.
We used a forged 440 crank which we turned down ourselves in my lathe and bored the 383 block 60 thou to give 438 inches.
Block was machined 20 thou to zero and square it.
The crank balanced up real easy.
Pistons are Diamond flat tops and the rods are new H beams.
We had to notch the bores to clear the rod bolts.
Cam is a Comp XE274H.
Heads are std Stealths with the retainers and locks changed to Comp 10 degree items.
Rockers are Comp ball and ball iron rollers.Pushrods need to be 8.2".
Intake Edelbrock Performer RPM with Holley 750vac.
Compression is 10.3:1
TTI pipes.
2500 stall.
It's in a C body 65 Fury as a cruiser with some balls but hasn't been fired yet.
My brother(his car and engine is hoping for 450hp.
I'm thinking 400.