I run a 4l80 in the belvedere, 3800 stall with lockup and trans brake.. Controlled by compushift adjustable controller on the dash. I had to modify the right header collector and the tunnel. I love it. 4.30 gears and 75mph cruise at under 3000rpm. With the compushift I can set pressure, shift speed, overdrive in and out all on the dash. It uses a TPS run off my dominator carb with a linkage. Shifts like a normal trans in drive. At 90% throttle or above it goes into race mode and up shifts at what rpm you program into it. It is on stout trans. I drive with hand controls so I needed a trans that once I put it in gear is hands off, thats why I opted for the compushift controller. I am using a Wilcap adapter and ATI 130 tooth flywheel. Downside is weight and size.