Cookie?
There are always tradeoffs. You have to find what those are for your specific combination and work it from there. When I was looking for my old Z28, Marty Chance told me to stick with the TH400 since it'd be faster off the bat. He said if I wasn't willing to go through the process to fully optimize my combo, and just wanted to have fun with it, stick with the TH400. Reason being was that converter choice was MUCH MUCH more important when doing the powerglide. With the TH400 we could do a good guess and toss it in and go have fun. He also did say that if I were to get more serious about racing, then the glide would be more beneficial for my specific combo since it's a class that didn't allow progressive controllers on nitrous setups. That softer hit from that low first gear would help my torque arm 4th gen F-body keep it off the back bumper since even with limiters it came up pretty damn fast.
Ron - wonder if Jim coulda gone faster than 7.95 @ 182mph on pump gas if he had a T400 in that b*tch? hahahaha
I bet that 4dr '67 chevelle on turboforums would go faster than 8.9x at 3600lbs with all that JUNK setup he has in it if he got rid of his junk powerglide