How original is the car?
red brake drums?
original transmission? what speedometer pinion?
what axle?
has the front end been rebuilt?

very few 15" wheel convertibles, especially at the beginning of the year

the 14" "ROAD" wheels are the more expensive OPTION, but the "RALLYE" wheels were NEW for the '70 model year

I'd determine the dates on the 14" wheels and POLYGLAS tires (as well as the specifics of your spare) - how many miles were on it when & what year did you purchase the car?