so in order to build a very accurate version of dynos 64, youll need parts from both kits. The motor, traction bars, wheels, tires and misc stuff from the fairlane, the chassis from the moebius.
in 1:1/reality, the fairlane chassis is different, the 64/65 comets basically being the same car (though there are differences year to year) BUT Dynos cars were set up differently from 64 to 65 as the 64 rear suspension made the car squirrelly to drive (same with the thunderbolts)
Im basing my thoughts on my fathers vast information as a 60/70s ford and mercury drag race historian,getting to speak with drivers from back then etc. and owning my 65 Comet for 27 years. If you need any info, let me know and I may be able to point you in the right direction.
With all that said, if 100 percent accuracy doesnt matter, Id say go with whatever fits better at your skill/comfort level.