It would’ve drove, but I have the top of the engine torn down right now. I replaced the 8-3/4 with a Dana S60 a couple years back with new springs/shocks.
I wish I'd gone with a 3.56 ratio in the Dana 60 I put under my Barracuda. The 4.10s make driving too expensive with today's gas prices.
I asked about the condition of your Charger because I was assessing whether or not a major floor modification was practical. I don't know how much cutting you had to do for the 5-speed but it was quite a bit for the 6-speed in our car.