318 Duster Rebuild - pros and cons of keeping matching numbers

My 71 Duster goes to the shop tomorrow for a fairly extensive restoration. I’ve had this car since new and I know that all major components are still matching numbers. My question is - does it really matter if I keep matching numbers or should I pursue the best solution for the engine, transmission, and steering set-up? I currently plan to have the engine rebuilt - but the shop guy says I might have a better engine if I get a new one.

I’m not trying for more performance - just a car that is much like my original new Duster.

Thoughts?
Dont let guys talk you into the rabbit hole of crate motors, strokers ect. Rebuild the original engine, and put the car back like it was when it was new, that's what you said you were after.