You can use either the 153 tooth or 168 tooth small block Chevy V8 wheels as long as they are for the INTERNALLY balanced engines and not for the 400 small block or the post 85 engines.
The 153 will only take the 10.4 inch clutch, while the larger wheel will take an 11 inch clutch.
The starter will have to be compatable with the flywheel. Both starter bolts in alignment goes with the 153 and staggered bolts on the starter goes with the 168.
You also have to have the correct bellhousing to clear the larger flywheel and associated p-plate and clutch. The one with a bulge for the starter is for the 168 wheel. The one with a flat side at the starter location is for the smaller wheel.
