you will need 2 wheeldrive BB mounts.

should be able to add the pawl rod to your VB. when you change the tail shaft you will KNOW if it has the cog wheel(most likely does)on the output shaft. or use another VB. any long tailshaft 727 for parts.

cross member will be same/same location unless 87-up chassis when it changed cross member and mount.

you need a rear sump oil pan with pick up tube/oil dip tube in sump of pan/make sure to plug hole in block for car pan dip tube.

if it has a front sump pan with windage tray you can use the windage tray with rear sump pan.

I used a set of hedman 79250 truck headers with 3" pipes and 3" 2chamber muffs dumping in front of rear wheels.