318 Duster Rebuild - pros and cons of keeping matching numbers

I wish I did but I really don’t have what would be needed (skills, equipment, or space) to strip the car down and have major body parts replaced like the firewall. I also don’t feel qualified to rebuild an engine and install AC and power steering. I’ve pulled heads and have done the general stuff to keep the car tuned and running for 53 years - but I’m over my head with major work on an engine and transmission. I’ve been thru three sub-optimal paint jobs and look forward to getting a first class job done - including the engine bay painted and returning to the original Por-Red color. I could do some of the stuff - but I’d like to get the full job completed thru one shop before I’m too old to enjoy my car for a few more years.