Lol what? This site started out as a forum specifically for V8 swapped Zs. But, back to your question, honestly, I think pics (several good, detailed pics, not 3 blurry ones) here would help a lot. And although I wouldn't say there's a lot purists on here, there still needs to be a bit of discretion when choosing a car to swap. Depending what condition your 240z is in, and what year it is, and how much of it is original, I might advise you to just leave it alone. The 260z though could be a great contender for an auto-x car, but again, need to see what you're working with to say. What builds have you looked at on here regarding a tube frame? 74 5.0L Z did a great front tube chassis on his 260z, and that might be a good place to start looking for inspiration.