BB 727 to A518 Conversion

Hello,

So when I get bored at work I peruse eBay Motors and craigslist to see what vehicles are out there. I came across a 76 Charger that was fairly optioned out, in nice condition that had a 400 2 barrel on it. It checked all the boxes of a vacation road trip car: A/C, power windows, cruise control (yes I like to be pampered hahaha), and just all around different. But this got me thinking.

With this being a big block, it complicates a transmission swap to the A518 since I believe the A518 never came attached to a big block. Now I know they make bell housings and adapters to adapt the A518 to a big block. But since the A518 is essentially a 727, couldnt you remove the guts from a big block 727, and install the tail shaft and the innards of the A518? That way you can get the over drive and possibly the lock up torque converter

I know there will still have to be floor modifications and the drive shaft would have to be shortened, but shouldnt the cases between the two be the same with just a different bell housing?

This is just brain storming to calm an idea I had this past weekend hahaha

Thanks