63 C-10 350 auto and parking brake question

[Tool Maker]

Ok so I have a 63 and I have this weird dilemma going on. I ordered the CPP transmission mount to go on this truck to fix a jerry rig that my dad did many moons ago. It was hanging on by one bolt and the rubber mount was broken almost in half. But what gets me is that he had welded a tab on the BACK of the brake crossmember, drilled two holes, and then bolted up the transmission.

So the real question is how does the ebrake member work in correlation to the CPP crossmember? Am I required to convert to the 66 mechanism? Can I move the old ebrake cross member back or forwards out of the way of the CPP mount? I see there are holes in the frame but idk what to do. Also, am I really supposed to remove the bell housing crossmember? Im used to working on imports and Im trying to go from a Corolla to daily driving this truck.

And before somebody says I need to search, I have searched for hours upon hours and I can't find anybody talking about these two particular subjects in one thread. Thanks for the help!