Getting the right starter

SoI learned something today

just because the internet says that it can be use for 168 tooth and 153 tooth

your block may not be drilled and tapped for it

The 168 tooth flywheels starter motors and blocks , are off centered Bolt pattern

and the 153 tooth fly wheel Starter motor Bolt pattern are straight across

since I am running 168 tooth fly wheel , I needed to drill and tap a new bolt hole As my engine block has offset bolts