Holes are threaded all the way down (far enough for the ARP's) the last 10>15mm of thread has never seen a bolt so is usually corroded/glooped and this is what the chaser removes, a "chaser" is very different to a Tap as it doesn't remove material, get it wrong with a Tap and you end up with a...
Forged is a good way to future proof a build in case you change plans and want more power later...
If you're concerned about Slap just have the Pistons coated and close down the PtoB clearence a couple of thou.
You need to fine one with a non return valve built into the signal port from the intake, just take a length of 5mm clean hose to the junkyard hook it up and blow, if you can blow pass.
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