Just to throw in my perspective I'm into numbers resto for cars that
should have them, like an A12 69 1/2 or a Charger HEMI R/T. Or a rare combination you can prove. If it's a base car, sure go for it, as long as you don't try to cheat or trick someone!
But for me it depends on the car and what you're doing to it...
Since you're asking in the early B forum, I owned a 65 Coronet for 28 years. Bought in the early 90s for a driver classic Mopar. (I'd
always wanted a 68 Charger, but back they out of reach for me, even the drivers.) Picked up the Coronet for $5K. 500 dress trim, a 383/727, and AC, PS, PB. Original Arizona Car, now in CA. Paint still had some shine. NO rust, couple of slight dents and one bondo'd quarter crease.
The car was more than I expected though... It was close to a survivor. 80K original miles. Great interior (intact seats, perfect door panels, headliner, etc.) AND I was the third owner. The second guy gave me original paperwork. No window sticker, but service docs going back to the 60s. Original manual, warranty card. Heck even the paper label to hang on the AC knob to tell you which way hot and cold turned for those unused to AC!
And I kept everything I ever took off the car (radiator, fan, starter, etc.) Because I thought of myself as a caretaker. Yeah, it was just a 65 500, not a Max Wedge or HEMI, or high-buck late 60s muscle, but it's a time capsule.
When I moved and decided to sell it, I wanted someone who felt the same. The right buyer said "We're just taking care of these cars until we pass them on to the next guy" I knew I had my man! He kept in touch for a while, showing me the good resto work he was doing.
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2021
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I got my dream 68 Charger. Had to sell the Coronet
and sink a chunk of change from our house sale (now cost 10 times more than in the 90s!

) It's an R/T clone. (No way do I have the money for a real R/T, or want to drive one on the street!)
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