It's a Sept build '66 model year. I absolutely would not change them if I knew they were original. I'd take the point deduction and not worry about it. Although, I would make efforts to educate the judges as they normally should ask before judging if there is anything unusual or not typical with the car.
+1 If it helps I have a number of original examples around and before your car was assembled at San Jose with the early/65 horns. Have your documentation in hand and organized and present the findings before the team starts.
...........And while I'm at it what else do you see that I'm going to get points off for? Thanks!
I take it that your car doesn't have a 71 or 72 DSO
You have another dozen or more things to try and correct prior to the show. Allot of easy things (some others have mentioned, missing wire retainers, dum dum on the washer nozzles, lack of sealer on firewall, where the black engine compartment paint transitions to body color at the top rear of the engine compartment, bolt finishes, incorrect bolts (like the ones for the horns & possibly the shock tower support ones), AC valve shut off caps missing, shock color, looks like breather also.
Your choice of dress up kit and what the judges might allow in that class might be interesting given the valve covers you have.
Not going to be easy to fix other things (the drivers fender) shown in the picture but you can greatly improve your score correcting the "little" details
If you don't get them correct this time you'll have time before the next show.
That's enough to consider right now. This is not meant to be rough just responding to your request and you have allot of things that are right.
