That is one fine looking flathead!
I am reading in Weertman's new book [excellent] "Chrysler Engines" and it appears the 1958 230 came with a 2v carb, I dont know the CFM but it might be a good reference point.
I would think either Carter W-1 or YF would work if you have the clearance, there was a shorter Carter RBS? but two of these might be too much cfm. I like the Rochester B/BC/BV ok too, there's a small, medium, and large CFM of those. I have not had good luck with the later Rochester Monojet (late 60s).
What compression and cam do you have inside?
Nice picture, nice induction setup!
