Cast iron 4bbl intake differences between 340 vs 360

While both intakes are good performers, one would be limited by carb size by the older 340 intake. OEM 340 carb wasn't big, 625cfm perhaps? Might find a 750 that would work without an adapter or opening up the holes. (Adapters usually restrict cfm.) You're limited to a bolt-on spread bore with the later 360 intake, but Thermoquads flow between 750 & 850 (depending who you talk to.) and perhaps a bigger spread bore may fit as well.