My dad and I pulled the motor in his 56 T-Bird last year to paint the engine bay and detail etc.. After putting it all back in, the car has lost considerable acceleration and it will downshift abruptly without flooring it.

We're pretty sure the downshifting woe is a linkage problem but we're stumped on the acceleration. We only tuned the motor up while out, (timing set, rear main seal etc...), we didn't have any of the reciprocationg assembly apart.

Anyone out there have any experience with these cars?? We think it might be a carb problem or the secondaries not opening. It's a 312ci, all original. Thanks everyone!