cable tranny adjustment

I know why Ma Mopar replaced the cable operated trannys. if not all the trans mechanics would have all gone to Hell from cussing the thing!??

yes, I do have a 65 FSM.

piecing this cuda back together... I got the 65 273 cuda running ( after dropping in the engine and an unknown condition 904). it started, engine sounded o k , lots of oil pressure. of course its jacked up in the back end. it starts, the sucker is in a forward gear, but shifter is in park. it will not move out of park. I take the park cable loose. I get the shifter into the other spots for the other gears, but still have forward only. I try to adjust the gear cable, I back off the wheel, the cable will not budge. is this due to PARK somehow????? thanks for any input..