I was talking to a friend at work and got on this very subject. I happened to have my Mark Williams catalog in my locker so I grabbed it and my ECTA rule book. We looked at the unwelded chassis kits, and the rear-engine dragster's wall thickness was below any of the class minimums. The funny car kit had tubes that would only be legal for J, K, and L engine classes, assuming of course the largest tube shown in the parts list was for the roll cage but it doesn't say.