I think your pretty low on your trans and head prices, when you start making that much power you move into something completely different than a 500 horse small block, figure with a converter abut $3500 for a trans and at least $2500 for heads if not more. You might want to look at the 9c1 cars to save some coin too, if you do go the Impalla route make sure you do a lot of research becasue there are a lot of clones being sold as the real thing.