Give it a shot, you have little to lose, and it's your best chance you will ever have......
Don't think NorCal A's were any picnic in the late '70's either. Almost every top 30 NorCal A was a former D-1 singles player, and some guys like AndyLuchesi and PeterPearson made first rounds in the main draw's of ATP tourneys.
NickSaviano played at GoldenGatePark at least 10 days in '78.
TomBrown was one of my practice partners in '79.
WhitneyReed played there lots.
ArtLarsen was about the first guy to invite me onto his court in '76.