what are these wheels worth?

IMO, the center caps, called appliques in the parts catalog, are the same color as the 70 models. IIRC, the 71s had a darker finish. Here are the part numbers to look for.

p/n 70 3461 065
p/n 71 3461 351

Wheel Vintiques p/n 2027 (dark), 2027A (light)

trim ring 2944 424

The same trim ring was used for both years. According to the parts book, V and L models were not fitted with the brushed finish ring.

It seems to me that if the trim and wheels are good, $300.00 would be a fair price for the set.