I believe you are referencing JF Petro 2nd-1989 model bred at Farris Ranch.
Sired by Petro Maine bull. On the dam's side you go back to AYATOLLAH who is of Illawara blood and was a monster in the 80's. Petro 2nd sire was out of Petro who went back to the famous Lou Lou Maine cow, as well as Cunia in there and Univers. Lots of folks on here can tell you how LouLou bred and Ayatollah too.
My suggestion would be to use on a small made soggy cow that can calve pretty easy. BW EPD 4.6 with CE -5.5. I think I may have a picture but will have to dig for that one.
Attached is a Grandson of Petro 2nd bred by McKee family bull called Maverick.