Hi Darrell,I have had the dash out of my Bird and it is not the same as the truck. The car has 2 L shaped brackets bolted to the A pillar and to the bottom of the dash and screws along the flange under the windshield, there is nothing like that in the truck.
I would be interested in seeing what the linkage looks like. If you have it out could you take a pic and post it here? Others may be interested as well.
Also I would be very interested in getting good window and door regulators for my '56. The splines are ruined on mine. If you have a source of good ones I would be glad to buy them and a vent handle. I will try to send you a Personal Message with e mail. I see you don't have PM as I and Paul have (his is turned off) but mine is turned on so you can send me a personal message with you e mail and I can get back to you.