Originally Posted by mgoblue9798
Ray I have done some checking and a 12" converter can be used if a midplate style adapter is used to mate the 518 to the big block. If you go with the ultrabell instead of adapter then you may be limited to the 11' as Guitar mentioned. Just a heads up.


Thanks - The Cope Racing build would have such a plate.

I'm still on the fence regarding the main options:
1. 1978+ locking TC 727 with lower 1st and diff ratio change.
2. Same 727 with GV and modern low stall TC
3. Well built 518

Another consideration is that the A727 has the P-brake on the tailhousing. Id have to weld on a pinion brake if I lost that...