When I took the cab off the frame one of the cab mount bolts hade to be cut off. I fixed the passenger front cab mount by cutting out the floor to get the nut out, then placing the nut in a vice and heating it with a torch till the remainder of the bolt screwed out easily. Then reinstalling the nut and welding the floor back in.
I then was able to set the cab in place so I could check engine and trans clearance.
The trans hit the cab even with the slider mounts in the forward most position so I decided to cut the trans tunnel a little more to get the engine back farther.
As it sits the engine is 2in to the rear on the sliders and the engine and trans is sitting with a -3degree angle the match the pinions +3degree angle. and the transmission has about 3/8ths clearance to the cab.