H/C or 383 stroker kit
If it were me, id build a decent 383 or 396 and keep checking the clasifieds for new, near new, or good used heads and a FAST intake/TB combo. Some killer deals in the sale section right now, maybe could even find some parts for teh stroker or just buy a motor.
an aftermarket shortblock would be the way to go. then sell yours or keep it as a backup.






