I'd have to take a looks again but with the straight plugs the end tubes would be fine but the center plugs would be closer. The center tubes wrap down close to the block. I actually think they would be better with the E heads. BUT Moparts member whiplash HAS them on iron heads and turned me onto the ball & swivel mod. He emailed me some rocking pictures and I actually posted these to repay the favor. Maybe he'll post them here.