So I got the 650 CFM version, installed it and it fired right up. It's actually a pretty nice carb with screw in air bleeds and 4 corner idle. Took the truck for a short ride and holy crap, it really woke the truck up. I'm very happy with that. It needs a little tuning as I'm getting a single pop back through the carb at WOT under load in 4th gear. I'll try increasing the secondary squirter size first and see how that goes. Overall I'm pretty happy with it right now.