Hi, I would recommend you to buy the car you want straight away. If you want a wide body car, then buy one! If you want a turbo, then find one! If you start with a car that needs a lot of work, you will end up with much time and money spent. Much better to find a good, straight car first time around. AND ENJOY - straight away!
These are tough cars, you mention Honda engines, how many Hondas lasts more than 15-20 years
... Yes, I thought so... How many of the cars on this forum is thirty years and more?
Yes, a lot of them... So yes, they are built though. My car is a 1975 and of course it runs better than ever!
Join a local Porsche-club before you buy a car, that will supply you with information and possibly help trace YOUR car.