When I put the pump on my Valiant I tried putting it in front since I used the stock pickup. I really couldn't find anywhere that wouldn't interfere with the shocks, exhausr or rear end. I ended up putting it under the back of the car mounted to the panel the bumper mounted to. It tucked up high enough you really couldn't see it, and it never got hit by anything.

My '68 has it on the frame rail over the right side of the rear end, but it is a ladder bar with no exhaust.