Help with choosing /6 build type for newbie

I am in the same boat, having recently gotten a slant six, after a BB and SB. It is a convertible so smooth driving is primary. So far, I have converted to HEI ignition (GM 8-pin module & coil). I would like EFI, but no factory solution since the slant ended before that (as did BB), but I have ideas towards that. I think was Bill Dedman and earlier guys are doing with superchargers is amazing, but a high threshold.