/6 not wanting to start after capping off vaccum lines.

Sounds like you've done something to get the timing out of whack and now it's way too retarded. After you get the vacuum lines back were they belong, kick the timing ahead (maybe a bunch) and try starting it again. If the vacuum advance can won't let you rotate the distributor enough, moving the wires in the cap back against the rotation does the same thing. Just make sure you are advancing the timing and not retarding it. With the distributor cap off, rotate the crank back and forth with a breaker bar. Being able to move it any appreciable distance without the rotor moving is a pretty good indication you have a bad timing chain. If the timing chain has gotten sloppy enough or the outer ring of the vibration damper has slipped on the inner (common problem on high mileage slants verified with a piston stop and a degree wheel) the timing mark won't mean much and you're going to be doing this by "feel" as a timing light only works when you know where top dead center is and the cam timing is not jumping all over from a bad chain.