Well I have been doing this stuff all my life. I helped my grandfather rebuild a 455 in his Riviera. I can not for the life of me remember what year. I did more than hand him wrenches. I was about 10 then. I've rebuilt countless starters and alternators through the years. I've rebuilt brakes,carbs,and rearends with my grandfather. So I'm 35 now so I guess 25 years or so.