Alternators are the way to go
but you will need the alternator + mount and pulley - maybe a different belt
not sure about the fan
your carb accel pump rod might interfere-- a little creative grinding or reposition of the linkage
the regulator under the seat will need to be pulled out and the wires hooked together- (large reds soldered and insulated)-
while at thr regulator - lenghten the small blue wire to the alternator- from idiot light (key)#61
Make up a new 6 or 8 awg wire to the battery + terminal on the starter from the output on the alternator
we just replaced the generator on the 1600sp in our '57 bug with a 55amp alternator
also the voltmeter we are using is a lot easier than a ampmeter to hook up
have fun
hank
'57 bug "BlackBerry"
'58 type261 single cab "Ruf"
'86 vanagon syncro "Syncro da Dr.Mayo"
and way too many project waiting