Stock 318 2 Barrel Cam Choice

Thumper is Comp, Whiplash is Hughes, they are wide LSA type I believe, Mopar came out with wider 114deg LSA versions of the established 284 & 292 Purple Shafts late '90's-Y2k ish.
The Thumpr and Whiplash are both tight LSAs. That's part of what gives their idle characteristics.