I'm suggesting the van parts swap, too. There are a bunch of threads here about the P30 to old bus disc brake swap. But you've got the whole axle and everything, so maybe it's easier to just do that. There are kits to put modern master cylinder and power booster into your bus, so that homework's been done. It's easier to do that and plumb new brake lines and swap the rear axle than it is to jack up both vehicles and get them down to where you can roll the frame out from under the body. The van also gives you all the power steering gear, pump, etc. so with parts in hand at no cost, this homework will also be easier to do. And the modern steering column gives you access to a working set of turn signals that self cancel, along with hazard lights. You might even be able to give it a tilt wheel for added measure of hippie de-luxe :-D
Great old bus tho, glad to see it getting saved!
