Aluminator short block M-6009-A463V for moderate boost on street car or M-6009-A463SC for a full out race car running high boost. Cylinder heads are not required, stock unit flow very well especially under boost.
Are the heads trashed as well as the block? How much power are you looking to produce? The shortblock options depend a lot on the power level you are looking for.
hopefully the heads are still in tact, haven't pulled the motor yet. I'd like to run close to 500 at the wheels, but I just want something that can handle the power properly.