360 timing chain

hello,

I think im gonna change the timing chain and gear for my 360. It is a 1975 Motor with almost 100k on it. The engine is being used in my 75 Gran Fury Demolition derby car. My question is what is a good timing chain and gear for it. It jumped time on me during the derby. it still ran ok, but really bogged down and spit and sputtered when I got on it. I took out the electronic ignition and am using a points dist. out of a 1969 318. Let me know

thanks


Kevin