Pre-magnum flexplate on a 46RH?

Professor Fate said
I think I misspoke- 518/46RH are 727 based, so you need a B&M 10236. The 10239 is for 904 and it's derivative (A500/42RH) trannys. I apologize- I've had 904s on my mind lately.
Anyway, you've got the word from Johnny M. himself now- good luck!

Gotcha, thanks! I just realized that the 727 and a518(46RH) use the same flex plate and torque converter, so I'm good to go.

I really appreciate the help.