Don’t overthink it too much. Any e core coil that’s designed to operate on full voltage will work. You ain’t lightin nitromethane on 50 pounds of boost. Plugs gapped at .050 and send it.
FYI the primary resistance on gm coils of the HEI era were .5-1.0. I’ve used coils with primary resistance from .32 to 1.5 without any significant difference.