I can't imagine why anyone would want to take an original car up to that speed. The risk to life and property is too high for what gain?
I'm at about 700hp and 2000lb weight with my tribute car (not really a replica). I wouldn't attempt approaching 200 without any of these mods and wouldn't do any of these mods to an original car (or even a really nice replica). We'll see what it does when the time comes, but the most important mod is the cage.
From the bottom rear looking all the way to the splitter.
Hood looking at the radiator air exit and ram air box.
Nose sheet metal and ram air.
Cage