Flexplate is not fits the torque converter

^^I believe that is the WRONG flexplate^^

Here is the deal........273/ 318 engines are "already balanced" within themselves, and require NO external weights.......either on/ in the front balancer or at the rear, the flywheel/ converter

360 LA is "externally balanced" meaning it requires a WEIGHTED front balancer AND weights (off center) on either a stick flywheel or the converter

The same is true of Magnum 360 except that it requires DIFFERENT balancer / weighting than does the LA. EITHER LA or Magnum are called "external balance."

The flexplate you referenced indicates it is for INTERNAL balanced engines like a 318

THE ONLY OTHER EXCEPTION is if you have paid an engine builder to add weights to your crankshaft to balance the 360/ Magnum within itself. In that case you want neutral balance or internal balance components such as converter / flexplate

There are basically TWO schemes used over the years. The older LA used weights welded to the converter, but in a "swap" you can buy aftermarket weighted flex plates in order to use a neutral converter----which you appear to have

The Magnum engines from the factory CHANGED this---they used weighted flexplates and a neutral converter.

Confused? So am I LOL