Look at EFI Connections SBC page part way down.

http://www.eficonnection.com/temp/24x_coming_soon.png

EFI connection just sells 24X and 58X conversion stuff.

The 96-97 LT1 had a 4X wheel and...

The setup with the 1x cam signal on the front cover isn't available yet so not much detail. The picture does show double row timing gear sprockets.

You could use the LT1 kit for the double row...