i had this huge reply typed up and then my browser craped out and i lost it.. so here is a shorter version.
the first link has a special conversion ($400ish) bellhousing to use a t5 trans. might have mounts or you could prob use something like 2.8 mounts and some sort of bracket mounted to the front of the motor like it would have had in fwd position and bridge it over to each side.
the blazer mounts are higher and you might get lucky with placement so that you don't need ot get into the oil pan for clearances.. wont know till you get in there.
the largest obstical is the power steering pump and the intake. both are positioned completely wrong for rwd setup. the pump mounts to the cam on the back of the head. if you don't want or have ac, you might be able to modify the ac mount for the pump placement. since its placed low on (what would be) the drivers side. the plastic intake does not lend itself to mofications to make it point forward. i've heard of getting the older aluminum intakes and modifing it or simply making a custom one from steel tubing.
you will also need to make a custom header and since its on the pass side, you should be able to make a full length race style header rather easy.
if your wondering how i know all this.. I'm planning on replacing my 2.5 in my 93 with a 2.3.. i've done alot of research.. but those motor, specially the early ones that were built as factory hotrods are hard to find. hope all this helps.