Having been around the resto scene for quite awhile:
1. If its VERY low miles, check brake, gas pedal, or clutch pedals. Wear should match the mileage.
2. Speedos get changed, and used originals are available everywhere
3. The older speedos, (not sure about Mopars), but others, can be turned back with no damage. Some makes have internal stops that will get damaged if turned back
4. Low mileage cars tend to have many of the maintenance type original parts still there and they should be numbers correct, such as spark plug wires, ignition box, distributor cap, etc. (But don't go overboard on the spark plug wires and distro caps: Many people didn't use OEM tune up parts in the day for basic service maintenance). A good one on Mopars are the battery cables: These are hard to find original items and are not changed out often on low mile cars. Check headlights and windshield wipers: Original makes are hard to find, and a detail many quick turnaround artists don't go into.
5. Look for the proper overspray on radiator hoses and exh manifolds. OEM radiator clamps with proper show of age. Radiator hoses with proper OEM markings. Look close at the L shaped water pump hose: That one that is rarely changed out, especially with low miles / Check all belts for original markings
6. Engine paint: Should really really never be glossy, even on the valve covers: Even freshly painted engines the gloss tends to flatten vey quickly
7. Even though engine department decals are cheap and reproduced, you can tell the original ones and thier proper patina
8. Properly dated and coded window glass, especially the front windshield
9. Key signs are the small labels on the seatbelts with the date codes/manufactorer info on them. They should all basically match, or at least show proper age (Remember though, seat belts weren't worn allot back in the day)
10. Ash trays Almost everybody smoked back when. Look at wear of ashtrays, cig lighter: Is the cig lighter original?
11. Botched up/spliced up wiring under the dash
12. Look under carpet for proper jutting. Low mile cars dont typically have the carpet or jutting changed out
13. Up/down scratches on the rear quarter glass, or any glass for that matter that rolls up and down: Low mile cars typically dont have these
scratches
14. Original radiator cap and gas cap?
15. Original paint?
16. Low miles means you might see faded factory paint dabbings on various parts (Dif carrier, rear spring mounts, torsion bars, etc)
17. Windshield washer bottle: Patina, etc
18. Coil: Typically don't go bad or replaced on low mile cars
19. Less miles means almost every indicator light and gauge should work. Check inside all cabin lights for operations, dimmer should work smoothly
20. Spare tire, jack and trunk decals. Less miles, more chance all will be there, in the proper patina
All the above isnt really the rule. but something to get the big picture with
