You should be able to use a standard flexplate with any neutral converter, I believe the bolt holes for the converter would be the only thing to verify matching, and at the most all you'd need to do is enlarge the flexplate holes. But if you decide on a B&M flexplate (very thick and very little flex) and the block has been line bored you will need to check the crank/trans centerline, possibly needing to use offset dowels. If the centerline is off the trans pump bushing will wear uneven causing a leak.
