Really by the time you are done, if you install a bigger servo, you will just about have a BRF trans. Only thing is the MonteSS version will shift a touch higher than the BRF at WOT. I personally think the BRF is way overhyped. A CZ drives out in a GN super nice.(although I know it is not original that way) I would like the 3rd gear spacing to have a bit more distance before it comes in, other than that all is good.
The governors are the same except the orange gear on a BR, and a green gear on a CZ, or CQ. I have used both in a GN, and behind a small block Chevy and prefer the CZ, CQ.
Hope this helps,
Brian