I believe the "early" funny cars consists of the Revell early 70's kits. That would be the Jungle Jim Vega, The Gene Snow Charger, Chi Town Hustler and etc. The "late" funny cars would consist of anything that was a repackaged Monogram funny car from the mid 80's. Those would be the John Force Castrol car, Ed "the Ace" Miller car and anything that came after them. Most likely you're looking at using the early Revell kits unless it specifically mentioned a particular kit to use (i.e. Monogram Cop Out). Hope this helps.