Yessir, the 6 bolt 2.4 wideblocks came in the 88-early 92 Mighty Maxes, D50's, and I think also Monteros. The 7 bolt ones came in late 92+ Mighty Maxes.
http://www.projectzerog.com/mitsubishi_engines.shtml
I am sorta interested, what is his project?
Also, I am not entirely positive, but I think the wideblocks were only in the automatics.