440randy Dakota pickup and full size pickup magnum manifolds are I believe the same part number. Again you need to check the search function on the site. I believe there was an issue on 67-76 A body power steering cars with clearance. I dont remember 100% as it was several years ago. I believe the drivers side was either touching or uncomfortably close to touching the steering box along with associated plumbing issues with the lines. The jeep magnum RH is a center dump exit which would work better in an A body on the RH side. I believe back then guys were using the jeep RH and a 72-76 A body 340-360 LH manifold.
Hedman makes block hugger headers, however those bring their own set of problems to the table with making pipes to fit them as well. I have a set of the hedman block huggers for my 67 barracuda. The engine is in perpetual mockup phase, but they seem to exit in the right spot to clear the center link and steering arms if you have a good exhaust guy to fit pipes to em.