Not that I know as much as some on suspension design, but one thing I have found is that IF you have to go with a shorter upper link, you can overcome crazy pinion angle changes and binding by making the attachment point on the housing farther back from the axle centerline than the lowers. It seems when I am playing around with suspension worksheets that a similar ratio as the arm length helps. My 3 link on my 64 has a super short upper link, but is mounted farther back from axle centerline and I have NO pinion angle change over the whole sweep, and Im on bags. I also punched in everythign into the suspension calculator, and I still have acceptable antisquat and roll centers, which are all adjustable.
If you are going for Air ride later, and have a narrow frame, huge rollers, and tight fender clearance stay away from a panhard if at all possible. you will probably touch the tire to the fender on full air-out otherwise.
A watts linkage or sliding wishbone are ideal, as a triangulated 4 link works great for coilovers but tends to bind on air ride systems.
I know you probably have figured everything out, but just wanted to chip in my half cent.
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