I am using a Clifford with the stock 250 exhaust iron. Mine is an early Clifford and you can tell it was made to work that way - there's a big flat pad on the bottom where it bolts to the exhaust iron. I milled mine a little more so a steel plate would fit in between. I don't like exhaust crap eating away at my alum intakes.
But it does work, nothing else hit. Havent tried the Clifford with headers yet.
IIRC the Clifford and Offy are about the same height though I don't think I measured. I am running a 292 Clifford in a 63 Nova, still room for a flat 14x2" air cleaner, though a 14x3" will hit the hood.
