Frankenstien eh...lol
Looks like a l67 with a l36 LIM and upper plenum for turbo purposes.
I'd pull the s/c tensioner and idler pulley off as they're just going to sieze up anyway but I'd leave the l67 harmonic balancer on the l67 myself...mines the same way, no need to change it.
Looks like a diamond in the rough to me at a good price, with some TLC, fresh gaskets(and maybe a new short block) and cleaning up it should work pretty good.