383 appearing, 400 stroker with stealth heads question.

Chit, I'd go 500-511 or go home. Take an old Edelbrock DP4B grind all the names off it, have it ported to match the heads and paint it to match the engine. I mean heck, if you're gonna stroke it, STROKE it. lol
If you don't have a 470 don't knock it.