I own a 1973.5T and have had it over 20 years now. The going price for these cars is really what you can get for it! If you get the engine running you will gain 20-35K. Check out the Hagerty Evaluation Guide for good price guidance and note that you can add for AC, sunroof and manual 5-speed transmission.
You will PAY to have the engine or transmission rebuilt if needed. I just had my top end done on my 2.4L (pistons and cylinders) for over $12,000. Add another $10,000 for the bottom end if needed. Transmission rebuilds can run from $2,000 to $7,000 depending what it needs. Unfortunately, parts prices took a turn straight north over the past few years and now Porsches are very expensive to repair, especially our vintages. Your challenges now are the smaller details: Gas Tank (has to have internal, rust as it sat for so long), CIS fuel system components, brakes, clutch, etc. This presents major expenses and trying to find a reputable shop in your area. Tough choices ahead, but remember that once you get it running you may not want to give it up for awhile because they are a blast to drive and it will only increase in value.
They built so many "T's and their are just so many left. As a result the market is ebbing up and a well sorted 1973.5T can fetch over $90,000.
Beautiful color. Good luck.
Bob
73.5T
