65 Barracuda daily driver

Thanks for the advice, I'm gonna check the lifters when I have a moment. This engine swap is not going as planned at all, but at least I'm learning a lot (about small blocks) haha. It's been almost a year since the slant came out. The engine previously had late 60s exhaust manifolds on it, so the head was already ground down and I ground it a bit more, but I'll check the clearance again. It just doesn't sound like something like that, though. I have some '67 closed chamber 273 heads that I'd love to swap in, but those heads will probably need to go to a machine shop. Anyways, I hope I can figure this out soon and start daily driving the car again!