hi, welcome to the club.

yes, Datsun 1200 uses McPherson strut front suspension. You can buy Koni or Nissan/KYB strut insert cartridges. That's what most people have used since 1980 or so, rather than rebuild the strut.

A lot of hobbyists replace the struts with heavier ones from a 280ZX or other newer Datsun/Nissan.

Race parts are perhaps more common that stock parts in a way. Contact Peter Zekert, he was the foremost 1200 racer in SCCA and I think he still has some parts left. http://peterzekert.com. He's in the midwest.