RCD crank mount starter on BAE

I have a BAE hemi in a rear engine dirt/mud dragster. I was looking at running an RCD crank mount starter. The one that stays on engine. I have 15.5 inches of room from the pulley flange to the rollcage. Is this enough room? The guy I talked to at RCD didn't seem to know how long it was!!!! Said they would ship it, and I could return it if it don't fit. Would kinda like to know first for obvious reasons! Any help/input would be much apprieciated.