so basically it has to be a standard as old car BUT has to have roll cage? who does that?... if your going to bother putting in a cage then you would want to upgrade everything else too. apart from that it seems like a really good idea!
one from a 4k will have a different "bellhousing" and may have less or more bolts? but the threads should be the same so should be alright as long as youv'e got the right lengths - not too long or not too short.
need to earn some extra money so if you need anything done to your car i am willing to help out, for a small charge of course but will be much cheaper than any mechanic. I can get parts at trade price too so that makes it even cheaper.
I am not a qualified mechanic therefore i will do simple ...