Hey guys... so I've got a 78 mustang ll but it has a 68 v8 302 engine in it. The guy I bought if from said he advanced the timing on it for races... after the first couple of days driving it, I started to hear this really loud knocking sound that got faster and harder as I went faster... I'm scared to drive it. Could it be the timing chain, or maybe worse? What do you guys think? Would really like some feedback. I wanna get my baby on the road as soon as possible. Thanks!