normally there is only a few plugs that change, map sensor and crank so if you swap the sensors over from your car to new engine should be ok and work on normal ecu. Im sure the later silvertops had things like knock sensors and twin lambdas so although that wouldnt cause a problem its 2 vital areas that its missing, but it would work. All you would need is the engine and then swap it and use your ecu and wiring, but i dont think it would be a straight swap unless you got the same block, ie blacktop to blacktop. Now that I think about it the later silvertops had a coil on top of the plugs and no leads so your loom wouldnt have this connector so you would have to swap the coil pack inplace of your coil and leads.