someone needs to make a crank collar with a corse 6 or 8 spline drive and a oil pump to suit. aka all toyota inlne 6.. i havent really heard much of 1 and 2j engines with oil pump problems.
it will work.
a good example is the v8 ute series engines i work on, the modular ford v8 5.4 quad cam. smashes oil pumps very easily and has the same square drive as our rb engine. we had to get custom steel gears made, but still have the oil pump problem, insted of them cracking they bend and gall up..
where as the ls1 and newer 6.0L has the multi spline drive oil pump. never seen one break in a ute with over 4 years of racing. and they are a powder metal drive with sinterd oil pump gears.