I chose a female cap.
What bothers me much more than the height is that it touches the firewall rail in which the cover is housed. With the movements of the engine it can't resist for long.
Even if they are higher, do you know if the male caps have a different diameter at the level of the spark plug wire fixing pins, in the photos they seem to be slightly smaller.
I wonder if Progression Ignition has not modified its distributor since you bought yours to use a higher one.
In any case they don't manufacture them, I think they just mount their electronics in distributors that they buy from others, maybe MSD, otherwise why would they have the upper plate where the weights are usually installed?
I know that not everything that is installed on the 351C is suitable for the Pantera but there I was confident since you had already done it and Wylkinson installs them.