which type of Proportioning Valve do you prefer. The original style or an adjustable(sp). i do plan on going to 4 wheel disc also.

 

You're not going to be able to use the original style with a 4 wheel disc setup. The OE combo valve is set to drop the pressure to the rears a lot more than you'll want it to. What I'd recommend is SSBC's (or Summit's) distribution block with an integral adjustable prop valve.