Tunnel Ram on a 383

So I think what I might do is get the block bored maybe like 30 over. Use the stock heads, I would get them ported and whatever else they will need to be efficient. Probably use stock rockers, and a cam a couple steps above stock. Probably use the HP manifolds I have rather than spend the money on headers. The manifolds make a rather easy fit in an A-body. I haven't decided if I would stick with the 727 or go with a 4 spd.