I have 5.7 hemi 2005, with truck timing cover, and I am using ´80 GM-type 2 pump, installed with hemi pulley. I was using Pontiac Sunbird 1988 pump, cause it had a pipe connection for external reservoir.
Even the threads of the pressure hose was same like in the old mopar one. The bolt holes in the pump just needed to drill a bit bigger, attached with two screws to the timing cover. And also the pulley "eye" need a bit opening.