I have used a Rossler powerglide in the Opel (7.54@185) since 2000. Stage 2 twin 67's. At the time the car weighed #2700 w/ driver. 1:80 first gear. Best 60' = 1.18 with 4.10 gear and 32X14X15 tire. Dusty is very correct about spooling. I used a Neal Chance converter launching at 5,500 RPM.