Do you have a point system or HEI? The S post goes to neutral safety switch (if automatic) then to ignition switch--straight to ign. if manuel. The R post goes to the + side of coil if you have point system. If this wire is not there you will not get current to coil when cranking. ( does it start sometime when you let off the key ?) As to the round cylinder it is a condensor to filter out static for your radio. Has nothing to do with running.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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