You don't HAVE to pull the motor, just the head, but it all depends on if you want to go down the road of super boost. If you want to go for high boost, you'll have to have the block and head machined, lapping it afterwards is a good idea too, then us a metal head gasket, ARP head studs, and torque it down to 72ft/lbs. In that case, you'll have to pull the engine to get the block machined. If you want to push a bit more boost, you can just put a stock HG in it, torque it down to 72, and run with it, and that wouldn't take pulling the engine. It's a lot of work, more tedious than anything IMHO (like rebuilding a carb, it's not HARD, just REALLY annoying)
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