“Mild” 383…….
Pretty straightforward………
The short block sounds like it’s already sorted out.
Cam, for use with an 11” converter, something like an XE274 or PP274
Dual plane intake, 650-750 carb, headers
Heads can be pretty much any factory head with a decent valve job/recon/surface to 80cc/blended bowls(240+).
If done correctly……. Should in the 400hp range.