i owned an 83 for 4 years. did 3 clutches in it in the period i owned it (kept burning them up due to power) i found out clutchmasters can get you what you need otherwise 100 buck at autozone. make sure its for the 1.6l or 1.5l as they are vastly different in clamping force i found out.
my 1.6 e16 was making somewhere around 125ft/lb at 130hp but it had been bored 1mm so it was closer to 1.7l when it was built. i managed to find a nismo head from a old man in japan and snagged it lickety split as performance stuff for the e16 is getting harder and harder to find.