The 100-140A work best for me on the street. I can't get away with a 60A anymore. Where did the hook up wire on the alternator end up? Mines on the back, so any position its in works.....Some are on the sides and end up in a bad spot.
If that is a Chevy water pump Meizere makes a billet mechanical version, although I bet the studs only go as deep as the plate and that would probably be a bad idea...