Going by the book from Marti Auto Works who has Ford data base info, for 1968 HT "S" code 4spd stangs, there 1,194 made.
So sounds like new paint, new windshield, front seats recovered, (take a look at seat belts to see if those work), rebuild engine, maybe trans and rear end need to be gone thru. Does tach work? Condition of wiring harness?
Depending on what you take the restore to, I'd take a guess $18-22k range.
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George email: <[email protected]