I know "kit car" and "accurate speedometer" may not be a realistic expectation, but I found out just how far off my Brazilian VDO Speedo was today.
The speed radar digital read-out van showed me going 42 mph today while my speedometer read 50 mph. I've often felt that when my speedo said 80 mph on the freeway - and I was getting passed by lots of cars - that I wasn't really going that fast, and apparently I wasn't.
It's no big deal, since mine's reading faster rather than slower, but you might want to check your replica's speedometer to see how accurate it is (or isn't).
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