Help me to decide if keeping MVB

I didn't mention that I've been driving my other 727 truck around manual shifting since Friday. I'm not going to use the MVB since it was getting old quick. I really enjoyed the 904 that had a TF-2... so I'm going with one. I ordered a TF-2 and the OEM reusable pan gasket. I'll remove a VB from either a /6 or SB 904 I have. I have to check the model years. IS there a thread somewhere about what sizes to drill and what not to modify with the TF-2. Thanks a bunch for the suggestions and comments.
I don’t know of a thread but as far as hole sizes go conservative. The line pressure boost help shift quality a lot. If you go too big on transfer hole sizes you may have shift overlap or harsh shifts. And do what I mentioned about only grinding the throttle valve about 1/2 of what they say. I’ve found 904’s aren’t quite as finicky as 727’s when it comes to shift quality