You might want to rethink this.
A rev. man. valve body is great in a street car,but in a truck it could be bad.........ie:

Normal shift is P R N 3 2 1

Rev body is P R N 1 2 3

If you need to get it into R quickly,it could be a
pain.

A trans brake will actual apply fliud pressure to REVERSE and 1 st gear at the same time (when truck is running). When released it can
shock alot of parts downhill in the drive train.

It will not hold you truck when it is turned off and park it.This is referenced to the part about line locks front and rear.

A manual valve body is neat/cool but when you stop,you have to physically put it into 1st gear and shift as you start to move.If you forget and leave it in say 3rd gear,when you pull away from the light you'll be trying to pullout in 3rd gear not 1st gear.

I would go with a "shift kit" and set it (drill holes etc)
so it is street/strip.This will give you full automatic shifting if your in 3rd(on indicator).

It will stay in 1st as long as shifter stays in first.

It will shift into 2nd and stay there as long as the shifter is in 2nd etc.

Linelocks are a very good thing <img src="/forums/images/graemlins/kewl.gif" alt="" /> make sure that you wire them up so they can have 12v. when the key is off....
for extended trail stops.........and then you can "turn them off" ....let's say when it's parked on level ground(so your battery won't die).

When you get it rebuilt ask the person rebuilding it about leaving the govenor spring and the servo spring out....it will speed up shifts and let the clutches slip less....
at least it did back in "the ol'school days" <img src="/forums/images/graemlins/smile.gif" alt="" />

Sorry so long hope this helps some.

Bansil