befarrer
+1y
I am not sure if you have seen this site, since it is where the picture you posted is from. But if you have the blue circled bellhousing, that is a Mitsubishi 2.6L. Is your truck carburated? If so then it is a Mitsubishi. I am not sure, but the 2.6L Mitsubishi is somewhat common, and the long block from other vehicles using the 2.6L may be a direct bolt in, just swap the manifolds. I know this engine was used in Chrysler Minivans in the 80's in FWD form, probably the Ram 50, and Mitsubishi trucks, but research will have to be done. There may be more engines that will bolt to the transmission, but they are probably fuel injected, so wiring would be complicated, and engine mounts will need to be made.
If your truck is fuel injected, it is a Mazda built engine, no relationship whatsoever to the Mitsubishi engine, and I believe the bellhousing is unique to the 2.6L engine.