Damaged crank flange

343...360 with a .090 undersized piston. is there a formula for tacking that weight on the flexplate, ie. 1/2 the weight at 2" as opposed to 100% of weight at 1" (not broken). I could easily make that weight appear on the flex or convertor if there is a formula for 'oz/in' with the 'inch' as the variable.