Agree with Bob not an easy task in many ways and often that is why builders choose to build clones/copies of specific cars rather than a homogenized version of a bunch of cars - or in turn a car that never was.
Most will start with a specific car that they are interested with based on its history, race that it won, color that they like or other reason. From there search out possibly a magazine article that had allot (or at least a fair number) supporting pictures then go down the list of reaching out to any of the builders, sponsors or ex owners of the real car.
I think that if you research and look at them all both years your going to end up with not a clone or copy but something else that might not have the impact your looking for in a finished car. Just my thoughts
So IMHO narrow down your focus, start collecting and searching out both national and regional publications from the period as a start
Unfortunately have a fair amount of 66 and 67 details but not the later cars