Gen 3 Hemi doesn't fit into a-body cars very well. That may have changed, but the first guys doing it had to work at it iirc.

If you race frequently it seems smart to stick with whatever combo you can afford to keep running long term.

I have not been to the track in a few years, but the local Mopar guys never seem to be the ones who can make all the races for a whole year. Mopar guy blows a motor, differential, transmission, etc and they miss multiple races before they return. GM and Ford guys seem to get their cars repaired and are back at it the next weekend or two. Mopar guys here have fast stuff, no doubt, but at the end of the year it's the guy with the budget build 454 single four barrel 72 Nova that takes the track championship because they make all the races.