16:1 manual w/fast arm

I have the FR in my Barracuda now, this is my cruiser , and with a 4sp at low speeds it's a bit much(getting old I guess) so I'm converting to pwr for that car.
In my Challenger which is mostly a strip car I have the 24;1 with a quick arm, it's still too slow so I'm thinking of putting the FR 16;1 box in that car but I'm concerned that with the quick arm it might be too much. Hate to have to but another arm,