Powerglide over here.
I'm running a glide. My car is a lightweight car though, roughly 1900# without me. I'm using a Coan 5 clutch forward / 5 clutch reverse with a bracket style brake. Also using a Coan 8" 5100 stall convertor.
Uses appx 15-20 less ponies than a 400 and weighs about 30# less. Also much easier to package since it's so much smaller. I bought a built one and put a JW bellhousing on it, it was originally a Chevy bellhousing.
There is a mustang hybrid with a stock block that uses a glide also. He is in the 9's with it. Chyke is his username on ********
Roger