the chain is really stretched out, and the cam gear is pretty worn. it had a double roller... one question i have though... Why do i have 2 sets of timing marks? one on balancer, another on the timing cover... i also noticed, when 0 mark on balancer is lined up with the gun sight, it is at 8 degrees ATDC. is that anywhere near right? i'm use to working on fords where they're all set for BTDC...