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Depends what year the B20F is... '72-'73 had the same 6-bolt flywheel as the earlier motors; '74-'75 have the 8-bolt flywheel, which I suspect is what's on your B motor.
A less critical point is that the F motor would normally have a D cam in it, while the B motor has the C cam (why couldn't they make the designations match up, anyway?). You may or may not need to go a step richer in the SU needles -- what's the compression ratio of a '74 B20B? We didn't have them in the States, so I really don't know.
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