I don't know if this helps but.

Did a 383 a couple years ago. Stock bore, pistons, heads, 906s, with a little shine in the bowls. Torker intake, 750 holley, headers. It was a true 8-1 compression. Used a Comp XE274H.

It made 355 HP@ 5000 rpm
387 TQ@ 4200 RPM