This may be the wrong forum in which to ask this question, and if so, I apologize. But there seems to be so many knowledgeable contributers here and I'm not sure where else to turn. My question: I recently purchased a 1991 300ZX NA 2+2 with automatic(from these classifieds!) with engine damage (the timing belt broke on the previous owner @ 130K miles). Would I be better off repairing this engine (valves/heads only vs. complete overhaul), replacing it with a used Japanese motor (is that JDM?), or could I swap in a twin turbo engine. If I could swap in a TT, what else would have to be swapped or modified?