[oletrucks] Alternator selection

["Mark Self" <mark.self@verizon.net>]

This is probably very elemental, but how do you select an alternator.  My '55
1st has a '79 Olds 403 init.  In checking the catalogs, I see there are
replacement alternators all the way up to 140 amps.  How much do you need for
a driver with air, stereo, electric fan & fuel pump and little else in the way
of accesories.  How much power do I need?  Is there a reason to have more for
future add ons?
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959