I bought the PlanetX Interceptor a few years ago, but honestly it's a poor rendition of the XB Falcon sedan. First upgrade is to replace the innaccurate rims. I found some nice "sunraysia" style rims in the new revell Bronco kit. it's not a straight swap tho. the tires needed to be wide and found some revell 48 ford street rod tires for the rear, but they were too small for the rim, so i excavated out the inner of the solid rubber tire and also filed down the rim until they fitted snugly.
I found some nice goodyears for the front and did the same filing. the rims are slightly oversize, but are correct otherwise, and have very nice chrome.