my dads old chevelle would get this (1964 ss malibu) you have to either wait for it to cool down or jump the posts, this is how it was for his chevell and the problems sound similar but i dont want you to think this is somthing you have to do.
i replaced my started myself on a m30, mind you its a completly diffirent engine, but im only 20 and was 19 when i did it, if you do your own breaks and change your own oil you can get at one on a m30 easy enough, goold luck with the 8