Switching to Hydro Clutch- Which Clutch Master Cylinder

[K2Orion]

The truck has a bit of an identity crisis. Its a 72 C10 that was originally a 350/350. At some point it recieved a 44/60 and a manual trans with the manual linkage. It had a 350/350 again when I acquired it. Now I'm in the process of swaping a 465/208 combo into my 72. I have a hydro bellhousing from an 85-90ish 465. I plan to use a slave cylinder from that same era. I was wondering what clutch master cylinder people were using. Yukon Jack used 1 from the 85-90ish with a shim, but mentioned the 88+ might work better because the mounting flange is perpendicular to the bore instead of angled down slightly.

I plan to reinforce the firewall and make my own adjustable pushrod.
So whats the hot setup for a hydro clutch?

[Beuford]

I used one from a `90 chevy 1/2 ton. I had to make a spacer to offset the rod to the left to clear the brake booster.

[special-K]

I've used '87. The early stuff was still metal.