The advance curve for a SBC is VASTLY different than the advance curve on a flatty. I know there are conversion kits and guys that do this for a living (GMC Bubba for example) so HOW is a SBC distributor modified for an acceptable curve on a totally different engine? I know this is a very common and popular conversion, so there MUST be a solution that I just don't understand. My understanding is that the flathead should be set at zero degrees initial, but with the SBC distributor it's recommended to set them at six degrees BTDC. (I still don't get why the zero thing) I'm trying to figure out what's best for my 8BA, thanks for the help.