So my car has been sitting for a while but seemed to run really good when I first started it up. Took it for a drive and it developed a lifter tick. At least I thought it was so I added some mystery oil to it to see if it would help and took it out for ride and it kept ticking but didn't quite sound as bad. Last night I started to take it for another spin and I thought I blew an exhaust gasket. So I limped it back home. Got it home and popped the hood and I can almost heAr the sound through the carb. It's like a popping metal sound. Put my hand on the motor and I can feel it hitting. I know not much to go on. The motor is a 318 in my 70 challenger.