If interested I have a 3.25" 10 row 4-bolt blower pulley for a whipple. It was included in a box purchase several years back. No other Whipple parts; just the main pulley. Good condition. Just been sitting on a shelf for several years. Nice piece. Couldn't bring myself to throw it away so if anybody needs it I'll take $40 for it/cover the cost of shipping.
BTW, there's a 2.3 Whipple head unit on feebay (looks mostly complete):