318, 383 or other? Which one

Update the rear supension with cal tracs and good shocks, then tune it. Add subframe connectors (weld in). I don't see why you'd have that much of an issue with the camaro. What times does it run now? More power is useless without sticking it to the pavement first. And air shocks and traction bars show a severe ignorance there. It doesnt take a lot of power to run mid 12s. It does mean taking advantage of every ounce of power tho.