I have a 94 MM, 5 speed,4wd. One of the rods is about to blow. It would cost about 3k to get it rebuilt, all new but same block. But I want to get something a bit... Bigger. I'm looking into some small blocks. What would be best? Would a small block be able to go in nicely, without needing to upgrade everything else as well? Any and all advise will be extremely helpful. Thank you in advance