help with history or paint

I purchased this 67 Dart in Ohio, previously from Texas. Contacted Texas owner looking for history but no help other than he thought it may have come from west coast Have been able to date building of the car by dating the axles and back half frame work as sometime in the 80's It has a Koffel 521 cubic inch 400 block with A/T ladder bars Dana rear, cage front to ladder bars no bars into trunk, glass hood,trunk,doors and steel front fenders. My problem is I want to repair some paint sections,not repaint the whole car as it is 90 percent in good shape and I like the color but can't match it up. Tried computer match and all known color books with no luck. Any suggestions or history would be great help.
Sorry unable to post photos,but can be seen on racejunk drag race, super stock section.
THANK YOU JACK