The most cost effective racing clutch I ran is from 10000rpm in california. double disc 5.5". Everything you need. from flywheel to pressure plate. All you need is an 71 -73 slave cylinder with adjustable through and fab a clutch pedal stop. No big deal. The flywheel is the standard l28 size so no grinding block to make things fit and no special starter. The whole setup was $895.00 and held like no other. This was after I shreaded a centerforce dual friction twice. Is it for racing and is not a good setup for the street due to the constant maintenance. But if you race then you are used to that
IMPORT RACING CLUTCHES & FLYWHEELS LIST RACER
APPLICATIONS:Datsun/Nissan, Toyota 2 & 3 TC, 20-22R, and 2.6 L Mitsubishi
5012 2 Disc 5.5 Clutch & Flywheel Complete 945.00 895.00
http://www.10000rpm.com/price.htm