I had a '77 Porsche 924 (2.0 Audi Engine) 13 years ago. Bought it as a damaged repairable. Body was OK but the engine, transaxle and many other bits arrived separately in boxes.
It was a very easy car to work on. I had cylinder head off several times and even removed the crank for regrinding, using only standard tools.
It all went back together nicely and turned out to be a very reliable motor. Great handling but not that quick by 1991 standards.
The ones to look out for are the 924S models with the 2.5 lite, 100% Porsche engine from the 944. These are quick machines, but rare.
Even rarer is the 924 Turbo, effectively a 924 2.0 with a turbo and a bodykit slapped on. These are even quicker and have serious classic status now.