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You can try to convince a potential buyer how the car performs and how much power it makes, but if you can't drive it, that "story" won't go far.
Given the aftermarket valvetrain, you definitely need to inspect everything to make sure it wasn't just one spring that failed. Do you recall what the engine was doing when the spring broke? High RPM, maybe missed a shift? Just driving down the street? What about the install process; valves adjusted properly, guide plates in place, etc....
I would definitely suggest replacing the entire set of springs. Check the pushrods to make sure they are straight. Maybe run a compression test to make sure that a valve isn't damaged (did the keepers hold the valve stem up?)
Replacement carpet may help with a sale as would wheels. Figure on at least $1K for a carpet set and same type of wheels.
There was no need for a thread - fix it. Your father is obviously an intelligent man. Why did you feel the need to conduct a poll, start a thread and insult his advice (and him)?
The regret comes much later lol. When you find another car and buy it and go "Damn that lt4 car wasn't bad at all, should've kept it and dumped more money in to it!"
Fix it if you can do it yourself. Paying someone else, plus the carpet, plus the wheels, just to try to get top dollar doesn't seem to make sense.
IMHO, 10-12K is strong money for a standard 95 coupe, even with a cam and borla exhaust. I'd bet more like 7-8K. However, a non-running car isn't worth half that unless you're a very good salesman!