I think they only came with one engine (rb30de). Make sure its not a pintara, they look similar. thats the 3.0ltr OHC straight 6 from the vl commo.
Rollas are pretty subjective. The 4age is a solid little engine so if its been owned by a grandma it could be fine at 250,000 but if its been in japan and been given a hard life it might be near dead at 150,000.
Jap ks are double our ks in my opinion. They drive shorter runs, harder. No long roads.
get a compression test done to be sure.