Motor mount options for header clearance

There isn’t that much room to be moving the engine that far. You may gain clearance in one place and lose it in three others.

If you aren’t wanting to sing the header you should have used exhaust manifolds.

BTW and FWIW, MOPARMAGA and I just installed some TTI’s in a 73 Duster and nothing had to be clearanced. You may be jumping the gun a bit.