Good advice and info.
I tried to go get a test today (to at least get a baseline and see what happened) but they apparently had a snow day... As did I!
I think I'm going to stick with my semi-original plan of getting the air rail and smog pump in and then seeing what happens.
I also bought junk today to replace the thermostat (runs cold), fix my front oil leak, and replace all fluids and filters. Basically base lining the rig... The PO used it only for elk hunting so it had sat quite a bit which can always be a bit scary.