904 Question

I have my trans out of the barracuda and have it apart. I have a glazed front 1 3/8" semi rigid band and it needs replaced. It has a 4 clutch direct drum and a 3 clutch foreward drum and was wondering if that was enough for a street driven 325 hp 340. I think I can buy thinner steels and clutches to get an extra one in each drum if needed. What type of front band should I get, a flex or rigid? Can I put a wider band on a 4 clutch drum?
The bands and clutches have about 600 miles them since being replaced so there in good shape.