Wonder why Guy sees it fit to use the Carillos over the howards in his stroker kits?
I don't want to speak for Guy (just guessing)......
I would assume it was due to both being high quality and one gave Guy a better price or was willing to do custom lengths (ie. stroker). IIRC Howards came out to the general public much later than the Carillos so it could have been what was available at the time...
Either way, I wouldn't worry with either rod.