80 300sd Timing Issues - Died No Restart

[Breckman99]

Here is a strange one for you; I was driving my car when suddenly it died w/o warning. (Although it has been making a rattling sound - classic indication of a timing chain failure) I attempted to restart and the starter motor wouldn't turn the engine over until I let it sit for a minute or so. I towed the car home and hooked a 500-amp starter to it and cranked and cranked until it started, while running I could hear a clicking sound from the front of the engine. Then it died again after a loud click and returned to the previous state. It almost seems the timing chain is somehow slipping! I have a new chain and associated rails, guides, ect. I have 5 days to wait for the chain press tool to come in so any suggestions would be helpful!!! I am thinking a link or two came loose from the chain and is allowing it to hop gears, or one of the keys (better not be crankshaft) broke. Any ideas?? - Thanks ~ William