Head choices? So many these days

We've just put together a 383 out to 438 using a forged 69 440 crank and 60 over.
Its only a mild build as a cruiser in a C body.
Compression is 10.3 and cam is Comp HiEnergy 274H.
I'm thinking it'll be around 400hp.Maybe 420.
We used stock 440 source heads with comp retainers and locks.