Front Uprights

[notacarguy]

Here's an interesting development. As I've been reassembling the front suspension I've discovered that my car has two right front uprights. Both have 3 degrees of caster. So when assembled the right side would have +3 degrees and the left side would have -3 degrees. Clearly not normal. What do you think, was this a purposeful set up, for oval racing perhaps? I don't know all of the history, but the car shows other signs of being raced. Or did at some point someone just grab a similar-looking part and throw in on?

And finally, I understand there were 3-degree and 5-degree options for those uprights. I believe the original Ace spec is 5 degrees. Would I be better off sourcing (or making, it's starting to look like) one 3-degree left or a pair of 5-degrees?