318 to 360 swap screwed up big please help!!!

I am also doing a 318 to 360 swap.I am not sure what trans this is,can anyone tell from the pic and tell me what B&M flexplate to order to make this 360 balance out. Thanks,EddieWell I cant get the pic on here but the trans is rectangular with one angle corner.I can email you a pic but i cant seem to get it to upload on here.