I just bought my 78 280z two months ago....I love it. EVERY bit of it. Its in good condition but I need floor pans, frame rails(maybe), rust cleaned up on body and engine bay. When I drive the car the first 10 miles to work it makes slight creaking sounds on above average driving. I have a special edition black pearl. It turns heads, everyone has a Z story, and the jealousy is amazing. I have two guys right now willing to do an RB20det swap from drop off to turn key...under $2000. Why? Well its a small performance shop that wants to get their name out there. I am going to decide against it. Despite the awesome deal. I need to get the car in a solid shape and driving smooth. Then I can always get a swap later. Like the guys above said. Think of this on a long term project. Build yourself a solid chasis and worry later about power. I could drive my stock 98 civic dx 5 spd with a pretty cheap aftermarket suspension and $100 each tires around our local curvy roads faster than several motored out mustangs, a pontiac G8, 2 new chevy camaros.....Lightweight and good traction(plus a bit of driving skill) easily outweights motor. Make sure your car is solid. Learn about the motors you are interested in and what their applications are in other vehicles. Find what you want to do. Save pennies and DO IT!