The Datsun stuff ruled SCCA in the 1970's, and if you take the time to go through some of the vintage road racing boards, it's likely you'll find a lot of sources for parts. While the BRE 510 was the car to beat in the day, those little B210s have a smaller frontal area, and what appears to be better aero, so it might make for a solid class racer with one caveat -
Nothing wrong with that, that's the sort of $hit that makes us all different.
Note Sid has slipped a dollar sign in on the cuss word. There are two reasons for that -
One reason is that we have a cuss filter on this board.
The other reason is that it'll never be as inexpensive to do this right as you hope.
But after a few years, one realizes it's only money and a screwed up FICO score, so why not?