Slant 6 intake/Exhaust Install

You're right about neither manifold being able to mate to a stock exhaust manifold. Each will require headers. No alignment issues at all.

or you could run WAGGINS /6 dual setup (cheap at 150.00 or 200.00) can't remember what I paid for mine.

Those Waggin duals don't look bad at all - sort of like the Dutra duals. Actually I have a Dutra Dual set-up plus 2 sets of Clifford (I think) shortie-style headers. The Dutra Duals won't work with either the triple SU or Weber set-ups but would be perfect for the Offy dual one barrel, Offy 4 barrel manifold or a Super 6.