Don’t get hung up on a set number, I’ve got a modded L99 6.2 in my 5th Gen Camaro. It’s got about 400 at the wheels and is still very streetable and a bast over all to drive. 600 is doable n/a but your going to give up nearly all highway manners for sure, I’d bet it will not be that fun to drive on the street unless your wide open and 6000+ rpms everywhere you go. Im confident you’d likely throw less money at a Maggie, whipple, or LSA supercharger. Then you can have way better drive ability around town and still have the ability to shred when you want. That said I bet you will find that 450-500 in an old truck is more than plenty. Even at that HP your going to have to do suspension, axle and brake mods to get it hooked up and stopped with out breaking anything or wrecking it. Here’s a little food for thought on the LSA:
https://boostdistrict.com/products/2...w-supercharger
That’s an excellent start and you’ve got more than enough meat in that L92 to handle the boost. Drives mostly stock when your not on it and hauls ass when you want it too. Plenty of people have taken 5th Gen LSA ZL1’s way over 600hp.