There is no arguing that nitrous will add more stress to the motor than a mild heads/cam setup (So long as it isn't a bitch shot
) You can run an le2 setup, just be wary of your shift point. The higher you rev, the more stress you induce on your stock shortblock. There's nothing wrong with doing just a cam now and getting heads later on. I am just trying to work with a budget here as you mentioned bang for your buck dollar wise and fbodies being expensive etc.