the fly/clutch is a duel mass thing which dont like anything over 170bhp so im told

the pedal box need to have a hydraulic clutch on it also the gear selector on the

gearbox hits the old brake servo

comp brake are making my pedal box pm nuts rus on here

sas on here has a 6 speed box in already he also sells the fly wheel

the gear link is easy remove the old one and bolt the st one on top cut a hole at the front of the tunnel run the cables through the hole thats it

here are some people who have done the 6 speed box
https://passionford.com/forum/restorations-rebuilds-and-projects/96301-m4drst-the-trolley-ford-fair-2013-a.html
https://passionford.com/forum/restorations-rebuilds-and-projects/171170-turboed-st170-6-speed-erst-now-zvh-and-gt30-rip.html