Never heard of having to convert to an alternator to an HEI. The HEI will draw more amps, so you need to increase the 12v wire to the HEI to a min of 12awg and to be safe it should be 10awg. If you are drawing near what the gen puts out for max amps, yes you might have to upgrade the gen/alt for more amps.

Larry

I don't own a vehicle that isn't old enough to drink.