Thats some good info on the heads. Looks like money well spent after seeing the work.

On the shortblock that I have, I may be better off to buy a full shortblock kit for about $625 with the pistons, rings, bearings, gaskets, etc, etc, than buy pistons and rings only. Seems the costs of the rest of the parts are very little after subtracting the pistons/rings out.

I wouldn't even chance cutting the block .100" That would be kind of crazy on a 70-HP block.

I think the best thing to do would be to have block gone over, then have the rotating assembly balanced, and have someone like Fast68plymouth build some heads that are ready to bolt on.

Still, its a $3500 investiment. But the motor would be near perfect other than tuning.