Carter 383 2bbl for SL6

No, the 1-1/2" BBD used on the big V8s is not a drop-on for the 1-1/4" BBD used on the small V8s and the 2bbl Slant-6 engines. Also, big 2bbl on small engine = poor driveability and fuel economy. This carb isn't the right tool for the job.
I'm not positive, but I think the big block BBD carb has a different bolt pattern, then the small block/six carb.