New heart! RB style

Well more bugs! Took it for a drive yesterday. Got on it pretty good once it started making boost the tires spun the rpms climbed hit the limiter at 6800 and I heard a pop. Sounds funny too. So I go home expecting to find something bad. Pulled the hood off. Found it chucked the alt belt. no big deal there. So I started with pulling the valve cover expecting a broken spring or rocker or something.. Nothing there. Pull the harland sharps off expecting a bent pushrod. Nothing there. Pulled the intake expecting a roller lifter failure. Nothing there. Dont have a compression tester but they all feel strong with the finger test. lol. So the thing I probably should have checked first was the distributor cap. I looks pretty gross inside. Looks like some bits off build up on the ends of the teminals and a couple wires dont look to great. looks like they may have gotten warm. hopefully thats the problem. Really dont want to pull the heads. probably ruin the headgasket and header gasket too. Those things run about 50 bucks and the headgaskets are another 160 bucks!! AHHHHHHH