i got a Zetec block for $200 . i am going take the cylinder head of the new block, take it to shop and have them port and polish the head. is this worth it?? thay are going to charge $900 to p&p then install the new head. should i do cam,Gear....Ect at the same time?? like two bird with one stone. what would my WHP be? Has enyone done this?