1968 Dart with a 340 amd A833

I have a chance to get a good deal on a Powermaster starter #9523.
I am out of state right now and need a fairly quick answer.
The starter that I am looking at is for a 10.5 inch flywheel, I understand there is a 10.0, 10.95, 11.0 flywheel. My car is a 1968 Dodge Dart with a 340. The reason I want this starter is I am going to be getting a set of TTI "Step" headers, and this is one of the recomended starters. I am hoping a 10.5 inch flywheel is standard on a 340 as the guy is knocking off about $70.00.