65 cable tranny-converto to slip yoe tailsahft?

I need a pushbutton SB tranny for the ongoing project. (64 dart s b) local friend found me a guy with a 65 pushbutton SB 904,he tells me it has a slip yoke tailshaft.!??

I havn't seen it nor has he. my questions are: can a slip yoke tailshaft be added. yes I understand you would loss the pace to attach the park cable setup.

OR did someone cut and weld a slip yoke type rear output shaft????? thus keeping the cable type tailshaft? and if so can a rear seal be used that WORKS!???

also, I ne ver have measured but aren't the pushbutton cables LONGER than the floor shift cables???????

I will keep the pushbutton setup as that makes the car what it is but I am changing it to a s b. thanks for any info!!!!