So I'm taking my 86 350 up to the hunting camp next week so I was putting it all back together today. After remounting the front fender, inner mud guards and skid plates I figured I would start it up and let er run for a while. I've done nothing to the engine whatsoever as the guy I baught it off of said he had just had the engine rebuilt by a local shop. So I put some fresh gas in it and started it up (had to kick start it cause the battery is a POS. It ran for like a minute then quit randomly. I kick started it again and it ran for a while longer then quit. I started it again and it kept running this time but with a very random idle (up and down). While it was running I held my ear close to the engine and I could hear what sounded like the timing chain. Should I be able to hear the timing chain circulating or does this represent a problem? Like I said I'm going to be taking it to the camp next week and I'd rather not have to tow it home. Any ideas what is causing these problems? The only thing I can think of is that the battery is new but the last owner didnt seem to fill it properly and never charged it fully. Would this cause these problems?