hey guys, just wondering what the stock harmonic balancer size is. i have a 351 i'm buying stuff for, and some of the balancer sizes are 6.3" and 6.405" and 6.500" ect...so i have no clue which one is right. i just want somthing that will fit a timing chain cover from a 74 351 which i believe is the same diameter as a stock 302 timing cover. so basically i just want it to clear the timing pointer or indicator.