I ran into the same exhaust hang up on mine with my 318. Look into different factory manifolds, they put those engines in a lot of different things, I'd look at car manifolds (GTO, F-Body) or maybe Hummer H3 manifolds. For my 318 I found grand cherokee manifolds that tuck in tight enough. Loving this build.

88 Raider sas, doubler, boggers