I need a hydraulic clutch

here's the easy button:

https://americanpowertrain.com/shop...ersion-system-for-mopar-with-23-spline-a-833/
obviously a big fist full of doubloons.

but you could reverse engineer it, which you've already figured out with the mustang you did. the key is just sorting out the throwout and then configuring the rest around it-- getting the right contour of the throwout face for whatever clutch you're running (obviously a concern with the early body stuff), the geometry/linkage & throw to the slave cylinder, the lines are a secondary concern, really.

the kicker is figuring out an inexpensive throwout-- i've heard everything from 90's nissan pathfinder, ranger V6, viper, 80's camaro; some direct install some requiring any sort of machine work to either enlarge the ID or on the mating face.

the only direct experience i have is with the mcleod throwout and a diaphram style unit and the S10 master on a later A so it's not exactly an apples to apples comparo. also, race car so not exactly a "clean" install.