BB and modern 8 speed Auto transmission ?

I looked into this last year and ended up changing plans once I realized the cost.

JVX racing has an adapter to get the trans bolted to the big block and Sound German Automotive has the controller needed to run it. You just need a RPM, speed and throttle position input if I remember correctly. It would work with my FiTech system.

Cleveland power and performance sells trans tunnels from Charger/Challengers for $350 I believe that you could graft in to give you enough room and has the mounts for a modern console of you wanted a Challenger/Charger style one.

You can snag a 2wd Ram 8HP70 for about $1200 online.

Then you are just left with a shifter and a driveshaft and adapter and probably some 2.73 axle gears.

About $5-6k all in depending on which parts you get.