A couple nights ago i went to drive home from work and as i steped on the gas in my truck it backed fired and stalled i do it again and it backfires again then dies but the third time it started up and drove but it was missing like crazy and had no power so i thought it might have been the carb maybe some gaskets blew out and sucking air checked it and it was fine same with the intake manifold so i decided to hook up a timing light to it and its way off time the line on the balancer is almost under the truck i tryed to set it but it will not even go to the scale on the timing cover it dies and wont start but it runs if i turn it back to the place it was before and the dist. vacuum advance it almost touching the carb so im guessing that night it jumped time real bad or maybe a bad cam? how would i set it back on top a buddy of mine said i could just pull the dist. out and rotate it on tdc and drop it back in straight? not sure any help would be great. heres a pic of where the line is at, u cant see it but its right about where the shadow on the balancer is.

 

Don't know what you're driving, but yes I'd say timing chain. For what it's worth.

 

forgot to tell, its a mild built carbed 350 no emissions just alt, water and power steering