best type alternator?

I will pose this questions to those with that fantastic electrical knowledge!!!!
my small herd of projects are basically this: 62-5 A bodies, stock slants to 273 cars, NO honkins sterios, no add ons, only thing I have been known to do is change over to MOPAR ecu. ( sorry no chevy HEI).
I try to read info in this forum as I admit to be lackin in electrical knowledge. when I replace the alt, I have been staying with the single field type, I even try to find one with the 35 amp vs 50-60 rating.
I have been runnin thru the in dash volt gauge for decades, even points and oem vr. ( I have bypassed the in dash volt gauge I admit years back)
should I buy a 2 field square back alt and just ground one of the fields??? or just stay with the smaller amp single field????? thanks