At this point there is really no decent (modified) RB motor that I know of in 1/25 or 1/24. I could be wrong, and if so, someone please correct me. The sample you posted, with the M/T covers and headers looks great! and would be a welcomed alternative to current offerings. Of course, I'm only speaking for myself. I do see your dilemma, with so many combinations though. (Mopar Magnum, Indy, Six Pack etc...)