Ralf, the 406 we did for my '74 Duster - A/C, 3.21 gear, street car - was pretty basic: iron heads, Eddy Performer, T-quad, 9.5:1 (a bit much on 91 octane), Engle 214/224 @ .050 & .470/.504 lift cam, basic headers. Pulled plenty of vacuum, great throttle response, 17MPG @ 70, more than enough power on the street, sounded healthy but ran smoothly. Stock converter & automatic. I'd do it again in a heartbeat but with 9.0:1 so I could run a bit more advance curve on 91, though where I live now the gas is better and I'm about 2000' higher altitude. With aluminum heads, the 9.5 would likely be OK. Also more overlap would ease the octane sensitivity, but the trade-off is throttle response & vacuum. Your car is probably 200 lbs heavier than my Duster, which tends to magnify the laziness of a big cam @ low RPM. Hope that info helps.