I love these cars! I had a 1967 1600 for about 10 years. Traded it in for the family van :-( , and wish I would have kept it. I still monitor them on e-bay, and a co-worker here is fully restoring one. The overheating is most likely a bad head gasket or warped head. The space between the waterjackets is narrow and a common point of failure. The head fix is pretty easy on these, though. In looking at a roadster, I always look to see if the original chrome is in place, especially the rails on the side of the car. That's worth about a grand right there. The back portion of the front fenders is always a pain for rust. I'm 6'3", so I had to modify the seat. I put spacers under the front mounts to get leg support for long drives. There are quite a few of these on the west coast, especially the Oregon Washington area. The SU's are very similar to the Z's and adjust in much the same way. Keep us informed. Best Regards, Rich