Depends on the quality of conversion and what you want to pay. I’d say less value than a standard one. You need to find out if the gearbox has been modified for the diesel engine. Or has a Mk3 diesel syncro box been used.
The syncro has diesel gears already but the final drive and crown wheel would need to be swapped over from a diesel box. 4T has 90mm cups and is taller than the 4S that has 100mm cups
