Plenty. For back then! There was also an optional 42 amp (1100696) and 62 amp (1117777) alternators available, so your car "may" have come with one of those. But you would need documentation showing them to be "correct". If you don't care about correctness, you can get one of those, or even go with a 10SI or 20SI internally regulated alternator used in the 70's and 80's.
Ed