thinking of doing the swap input wanted

Thinking of doing a gen 3 hemi swap and want some input from anyone who is doing or done the swap.
1. Which engine 5.7 or 6.1? want to drive and race the car.
2. stock k member or aftermarket.
3. carb or efi and what controller with efi ( mopar ecu, fast, or big stuff)
4. trans 727 ( which I already have behind the 340) can you get sfi flex plate that bolts in with no modifications?
Thanks for any help
Trevor