clutch
The only way to go is hydraulic, I retrofitted hydraulic clutch to mine which was a bit of a pain working under the dash. I used 620 master and standard slave.
I removed pedal box and cut off clutch pedal section, I picked up one fixing from bottom left servo stud and drilled and fixed second lower hole. The other end of the pivot was supported by made up bracket. I have servo fitted which prevents master cylinder being fitted high enough up the pedal which is why the pedal has to be lowered. The pivot point for the pedal should be approx 1" from master cylinder push rod giving you approx 5/6 to 1 pedal ratio. The hydraulics do not give you any mechanical advantage, it is purely pedal ratio and slave cylinder arm length. If the pedal ratio is incorrect say 3 to 1 you will still have very heavy pedal and very short travel.
I also reinforced bulkhead with 5mm ally plate just to be sure.
I advise anybody building to go the hydraulic way before fitting bodywork etc, the cable system is total crap.
good luck
Brian
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