C6 flexplate ???

Ok i just got a new transmissions ordered from a local shop. It is a C6 will a small bellhousing that fits to the small block 351w. I was wondering what flexplate i will be needing. I have a SFI 157 tooth 28 oz ext balanced right now. I was wondering If it depends on what size converter i get or what. I will be running a mini-high torque starter if that matters? When im on summit, and i hit in 157 tooth for the starter all my options go away for my starter, so im thinkin i will most likely need a 164 tooth 28 oz and whatever size bolt pattern to match my converter. Thanks for the help guys.

-AJ