porting cost?

Then this is what you need to do, have the shop that is going to do your heads bowl cut them with a 75R7 serdi cutter or a 75*taper cutter and do a good valve job, also have them surface them to clean them up and if more than .025 then they will also have to surface the intake side as the intake won't fit. Then have them gasket match them and your done and should have a good set of heads. Oh another thing to check is the retainer to guide clearence, as with high lift cams you need .100 seal to retainer clearence and this might mean cutting the guide and this will be and additional cost, but this is just part of the game.