Kid:Holman-Moody did indeed make Y cams and kits. I have one of there fliers and price sheets they sent to Ford and L-M dealers. I bought one from my local L-M dealer. Was a 290 advertised duration that didn't produce enough vacuum to operate the wipers on my '56 Bird. Sold it to a guy who put in his Y powered Model A, he loved the sound. Had to run in 2nd gear in town with his 3 speed. No torque if he put it in high.