I'm not sure what you mean by a "busted mounting point".

The oil pump bolts flush to the front side of the block. Unless you mean it's leaking somewhere?

I have never seen or heard of a "high flow oil pump" for B series but I have seen some better gears for the OEM pump.

Don't bother with modding the oil pump, honestly. The stock ITR pump creates more than enough oil pressure for street/track/anywhere unless you're trying to build an 11,000RPM engine lol.

Best thing to do would be to replace the pump with a brand new one and also do a timing belt job while you're at it, considering the belt has to come off to replace the pump anyway..