To get the exact color you are after you need to goto a Dupont, PPG, or Sherwin-Williams (automotive paint supplier, not Sherwin house paint). These three have formulas that go back that far and should have the color chips. The color chips you see on the computer screen is not exact and either are the actual chips. The chips are close matches but NOT exact. To get a 100% accurate sample you have to get them to mix a small amount like 4 ounces.
BTW if you are painting yellow put down a base of white. Yellow can take up to 7 coats of paint to get full coverage. By applying the white as a base you will need less coats (I HATE painting yellow!!!)
Also manufacturers can sometimes call a color one thing and the paint manufacturers can call it something else. Bodyshops and paint stores go by the code, not the name.
This is the result of a search on Sherwin's site with YELLOW in the name of the color and 1970 as the year and Ford as the make .....
Model Year: 1970 Hide Models
MFG Model Exterior Code Accent Code Vehicle Part Color Name Year(s)
Ford America 5 Exterior Grabber Yellow 1970
Ford America 5 Exterior Yuma Yellow 1970-1972
Ford America 6S Exterior Chrome Yellow 1962-1986
Ford America 9 Exterior Brt Yellow 1970
Ford America 9 Exterior Meadowbrook Yellow 1968-1970
Ford America 9 Exterior Pastel Yellow 1970
Ford America D Exterior Grabber Yellow 1970
Ford America D Exterior Yuma Yellow 1970-1972
Ford America G Exterior Chrome Yellow 1962-1975
Ford America K Exterior Meadowbrook Yellow 1968-1970
Ford America K Exterior Pastel Yellow 1970
Ford America K9 Exterior Brt Yellow 1970