PST tubular UCA too long??

The only UCA that will physically fit is from an A-body. B/E, C body UCA's are all substantially wider and won't fit into the mounts.

Sounds like you've done a bunch of suspension work lately, if the car has not settled down to factory ride height or lower then you won't be able to accurately set the alignment. If the ride height is too high the camber adjustment will trend in the positive direction.

The other thing is, have you checked to see if the UCA's are sitting all the way down? Most tubular UCA's for these cars will require trimming the UCA mount back in order to allow for full travel because of the thicker profile of the arm where the UCA mounts.

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It depends on the type of UCA and the car of course, the corner of that mount looks different on some cars vs others so some tubular UCA's will clear on some cars, but on others will hit that corner.