Bottom line, it's your car, do it your way.
If ya gotta lie to get the car and promise him a beyond amazing resto job, then promise him everything. Then do what ya want with it.
Resto guys cringe at the slightest waver. So F$%^* them!
If a resto guys whines and complains, tell'em he should have purchased it and you'll sell him the car for correction for 50,000 as a down payment. Kick his *** while your at it.