273 Numbers Matching car. Should I rebuild or swap engine?

273 said

To I wouldn't care about numbers matching non performance abody. That car will be worth more with 340/360 or better.
Could always store the original engine just in case. A 275 hp 360 (basically 340 specs) will be a way better performance engine and need a lot less gear and stall.

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That was my 1st thought, this is a car I bought my wife, so she is leaning toward keeping it numbers matching. She thinks it will be worth more that way later and I think putting a 360 or 340 in it would be worth more. Who knows. I guess it depends on who the Buyer is later....