I have have a 1957 Chevy with a 1961 283. Some one rebuilt the engine before I bought it. There are 2 timing indicator markers and I think 1 of them should be taken off or ignored. The attached picture (if I got that to work) shows the indicators and where it is presently timed, it looks to me to be too far advanced. Your help will be appreciated. 57 150

283 M.JPG