timing marks on a 1965 jd350 dozer

Technically the first year of the 350 crawler was 1966.   It depends on what timing marks you are talking about.   For injection timing you will need a little plastic window to time it.  The window keeps the fuel from running out while you are timing it.   I would suggest you go here:

http://www.jdcrawlers.com/ 

You will find lots of info for your exact questions. 

Larry, for some reason that link didn't work.

Try this one.

http://www.jdcrawlers.com/ 

Hi Bob….thanks for fixing that.  The URL not working is strange.