I'd do a very similar build to Mopers. I'd zero deck the pistons with the KB 318 slugs they have. (I think Moper was tinking that.) Aftermarket Con Rods if the OE's were bent or whatever. Port match the RPM to the heads if need be.
The other change would be a cam. I'd run a split duration of about 6*'s more on the exhaust side and go with a 3000 stall and 3.91's.
OF course, were not racing this are we? Looking for a more aggresive street stomper?