HELP! I bought a mess?

PRH said

Those are the factory “low performance” springs.
340’s used red springs.

Those heads most likely came off a 360-2bbl.

If you’re pulling the motor anyway, the “what I would do” answer is find a 360 and freshen that instead.

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I was kind of thinking the same. As I said in the OP I have a 2001 360 magnum out of my old truck I was considering just getting a refurbished long block for, doing the Magnum swap, and using all of the original externals and dress ups for it to make it appear original. I have been reading that if the 273 needs short block work the pistons are relatively limited in availability and expensive. For what my wife wants it for I kinda looking for info on what I have but also thoughts and opinions on if the combo is a keeper or the Magnum swap would work out better.