There should be a spade to square fitting in the engine tacho housing. The square cable end goes into the fitting and also the tach. Make sure the tach end doesn't stick out beyond the end of the round nut that holds it on the tach, when you pull the nut all the way up the end of the cable. There may be a collar on one end of the inner cable that keeps it from going in the sheath too much. If the cable sticks in the tach too far you'll damage the tach. Get a piece of tubing that will fit on the end of the cable and fill it with some moly lube and let it sit until it runs out the other side. Do all your cables like that.
It may be missing from stuck rings or what ever, having sit around for so long.
Bushmans also talks about how to set up the carbs with the cables, make sure in WOT the slides both pass the top of the throat at the same time. Then adjust the idle like he says. If your floats are set right, your best idle will occur with the pilot needle out 1 1/2 turn, but more or less is OK unless it's 2 turns or so.
Get it strobed, it shouldn't have kicked back, you may be way advanced.
Dave
69S