If Ford V8 or SBC motor is fine with -12AN, I'm sure the SHO
oil pump will be fine. The pump on these motors are very good. I had low
oil puressure with my last setup which used small lines. A former Ford engineer located in the Springs said the pump is enough to out flow one FL1A filter so he runs two on his blown SHO.
I understand about too large and too small... I've been on the too small side already.