383 appearing, 400 stroker with stealth heads question.

I don’t remember all the details of this one:
Low deck 511, 10.5cr, mild ported Stealth heads(290-ish), mid-sized street solid roller.
I don’t recall which intake, but I wanna say it was an RPM, QFT 950, headers.

648tq@4100
586hp@5700
Still 558hp@6200

Of course, if you could get past the appearance of the heads not looking stock, you’d make even more with some TF heads.