Art:
If he drives your 1641 and likes THAT performance over what he has with his 2332, then I would agree with selling what he has and buying a newly-built, turn-key 1641-ish with the proceeds. He may (should) come out ahead on the deal (money left in his pocket).
Why?
Because even with smaller carbs (the easiest first step before getting into engine internals), the engine will try to perform as it was built. It will still be twitchy and sensitive to the gas pedal in the low and mid-range (maybe even worse, as Stan alluded) and never be a "mellow" driving experience. I've tried to "dumb-down" type 1 engines in the past and, simply put, it don't work well for a lot of different reasons.
There will be a few eager potential buyers out there (and on here) for a well-built 2332. Get him to document who built it and what's in it and do a little research on here and the Samba for a price range and go from there. If he orders a turn-key 1641 (or even a nice 1776 like Musbjim had for years and loved) soon, he could have them swapped before the driving season gets into full swing.
Sound like a plan??