Desperately need experienced opinions on Engine Identification

MopaR&D said

Seems like a lot of trouble to go through for a 273, I'm guessing you're trying to restore your Barracuda with original close-to-matching parts? I'd personally just put in a 318 and dress it up to look like a 273 Commando but I'm far from a "resto" guy, I just wanna go fast lol.

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I totally understand your perspective. If it were my car, I would be looking to drop in a 340 or 360 at minimum. But the car belongs to my sister. She bought it in 1977 when she was 17 years old and has owned it ever since. She understands it will never be a numbers matching car, but she would prefer to keep it close to original. She has had family friends and relatives promise to get the car back on the road for the last 15 years. Her husband recently had the car repainted so the body looks perfect, but he did not understand the already swapped 318 in it was in rough shape.

My role is I am trying to get this car in running condition again and do a major favor for my sister. Too many people have made promises and not followed through. I know a 273 would make her happy.