46A 10345 would be a 1965 build.
I guess you mean this one.....http://cgi.ebay.com.au/Caterpillar-D8H-46A-Bulldozer_W0QQitemZ160114010309QQihZ006QQcategoryZ97121QQrdZ1QQcmdZViewItem
Looks pretty straight for an early H; pity they didn't raise the blade so it could be seen how far the tracks are adjusted out.
Looks like a very straight machine to me, but allow for new U/C, the rollers and rails look to be worn out, count the links, there may be one short!
I thought SALT rails usually were worn out externally needing a P&B turn because of sprocket wear or rail height too low instead of worn internally and track adjusters extended out to max.