I have a 12JC with diverter and want to go to a split bowl.  Found a dominator bowl for sale locally.  Can I just bolt on the dominator bowl and a droop snoot and put my JC nozzle and diverter on it?  What else is there to it?

If it's an early Dominator bowl, the tail shaft bushing size is different, check that out first.
I contemplated the same thing.
There was no advantage to the early Dominator bowl, especially without a droop.

If it's a later Dominator bowl, that's different.

Early was the bud-mar casting I believe.

Flusher and Tom at JBP would know for sure.

Dan'l