i am a dealer for RHS now let me look and see if they show that head in a72 cc head as for a custom grind you looking less then two weeks from the phone call it they have the core . ever thing would be drop ship to you . the stock lifters should do fine at 4500 if going past that then better lifters .low rpm max Tq lower cr so you can run so/so gass .tbi is going to be hard to run any cam you do not need big DUR any way s the map will not like it i do think we talk about this before ? i have been abit under the weather .so it some one wants to work this up i under stand. i will give you numbers monday the Kb I cons are a nice piston for the money .seal power in a coated hyper would be fine i used many. they work fine now they got all the bugs work out from shipping the piston line to inda