Dude, do what makes YOU happy.
The whole "it's only original once" philosophy creates a bunch of useless museum pieces. If you drive it any significant amount you can't keep it "original" without a serious grip of cash for NOS or "correct" parts because if you drive it you'll have to replace parts. It's a car, it's meant to be driven. Numbers matching, "original" cars are for boring rich guys that use their cars as bank accounts. Don't be a collector, be an enthusiast.
But if we let these cars be museum pieces, that's exactly what all of them will become in short order, because pretty quick there won't be anybody left to remember how awesome these cars really are. Or anybody that can still shift a stick for crying out load. Put it out on the road, drive the crap out of it, and don't listen to anybody that tells you otherwise just because it might be worth more some other way.
