Wouldn't it cost less to buy some tall pistons so you don't have to machine the block or the heads?? There are many companies out there that don't charge that much for a custom "stock type" piston.
Treblig
Could very well have been a cheaper option but I already have the pistons - the block was bored for them. And the head has to go to the machine shop anyway to finish the valve job and clean up (I got bigger valves and had the head hogged out for them, then brought it home to do some light porting/cleaning).