Can you ID this Mopar gearbox?

A problem about the bellhousing.

I want to install this A833 into my Demon, but my current '71 3-speed bellhousing doesn't accept 4-speed gearbox.
So, I have to use the 1966 bellhousing coming with the gearbox
Ok...

BUT, I saw that the Z-bar linkage attachment is different on the 1966 BH and on the 1971 BH :(
Cloches de boite.jpg

It took the dimensions of the two BH ball studs
They are both 6 cm long (or 2.36 inches, or 2(23/64) in.) including the bracket thickness

With a little luck, maybe that the BH ball stud, despite the difference of mounting bracket, is in the same location in 1966 and 1971..?

71 ball stud.jpg

'66 ball stud.jpg

Any help before the 3-speed gearbox removal will be greatly appreciated :thankyou:
François