Superstocker

I was recently asked to do a cam swap for a guy. He bought a cam yrs ago and has no idea what it is. Before i can commit to anything i have to know everything. He dug up his receipt and it shows the core being shipped from comp to a place in memphis. At this point im lost and on the verge of telling him i cant help him out. The numbers on the box read 3715R/3715HR114+4. The other number he gave me was simply the core from comp.
Any help would be greatly appreciated, thanks.