First of all - you already have a swing kit for this radio? No instructions? Is that kit made specifically for that radio? If not; it will not work for it. Swing kit part values are different from radio to radio. Sorry; that is the way the mop - flops.
http://www.cbtricks.com/pub/secret_cb/vol_09/graphics/secret_cb_vol_09_pg35_36.pdf
The ONLY mod I found for this radio (see above link) disables the AM Limiter. Which means that your AMC control ('modulation') will no longer work - it will be wide-open. This will also stress the
output transistors to fail prematurely. Do you want that to happen? Cannot use a power mic with the radio - either. And if you should run an amp with it -
it will sound like real crap! No joke. Better understand this now before you make such a leap. Do this mod at your own risk!
Better off with a Cobra 21, 25, 29 gtl/ltd if you must have a swing kit.