you can use GM alts either the CS or latest series of alternators, they are 3 wire which works way better than 1 wire.
i bought a 97 camaro alt. that puts out 80 amps for 25 bucks.
go to madelectrical.com for conversion kit.
mark at Mad is a ford guy & has all kinds of remedys for Fairlane wiring, including alt kits, headlight relay kits, etc.