ok so i need a crank pulley (hermon balinc) for a 5M-GE motor i have an 83 five speed i picked it up for $300 and its in pretty good condish but alot of miles 240,000 miles to be real so my question is how long do these motors go for wut should i be lookin for wut should i change and does anyone have a pulley i need one bad...........