Ehhh I’d say the only thing harder is a gen 1 hemi parts. Poly parts I can find all day long and twice on Sunday. And really, they’re only marginally more expensive than an LA. I’m fact, with the right part combos, it’ll use LA pistons. The hardest thing to find is intakes, but little known fact is that an LS carb intake will bolt on. As will early Fox body 5.0 GT headers.