I've been tinkering around with putting my LT1 into my '70 firebird and figured a carb swap is the way to go. I got the part numbers for the intake and Opti-plug I need to do this swap, but when doing a search I read that the stock balancer won't clear the timing tab on that opti plug. From what I hear I'll need a .184" x .680" key on the crank snout and a 6.75" damper.

Anyone know where I can find such a beast and if it would still have a serpentine pulley on it, I'd like to retain that belt setup and all the brackets.