yah whatever you do dont put too big of a cam in your motor i put way too big of one in my 352 i knew it would hurt performance but man does it sound good and that all that matters with a 352 haha lets face it they arent the cornerstone of performance in the FE series. i used a .530 .280 .230@ .50 cam. my 406 i just bought has a .526 .280? Holman Moody HA-B i cant really remember the duration but i think thats it