Modify it tastefully, I say. Although as far as I can tell, this forum is very much against modifying bikes (or maybe just specifically against my modified bike
I've searched your posts and can't see what you're talking about
Anyway I voted for a period restoration the only reason being is that STI shifters are so ugly! Nothing ruins the look of an old steel road bike like some hunkie chunkie STI units. Perhaps some nice old bar end shifters would be better suited. Just my humble opinion of course and the beauty of STI's is their user friendliness. The other thing to bear in mind is whether it is worth restoring, something which is entirely up to you...