I think first thing i will do is double check my shift cable adjustment. Readjust bands just so i know where there set. Next step will be getting a new vb to eliminate this one as the issue. Let you know how it goes.
Put the trans in neutral and the shifter in neutral. Adjust cable until it drops into the shift lever. I know it sounds elementary, but a couple of friends have struggled with this...
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.