fattest cam in a 340?

Read the thread carefully in this link. It will show you how to accurately locate your true top dead center and timing marks using a piston stop and timing tape. It helped me a ton!
I also discovered that the vacuum advance housing on the side of my distributor had come loose right before it went into winter storage so that was flopping around and changing the timing all over the place!
Runs a helluva lot better now.

http://www.forabodiesonly.com/mopar/showthread.php?t=265983&highlight=timing+tape+piston+stop