Motor and trans, back in.

I’ve been messing with the clutch fork and linkage. I have a few questions for any of the stick guys following my build.
Where should I run the spring off the fork? Factory it looks like there’s metal extension rod that connects the spring to the motor mount. I’ve also seen where guys attach a hose clamp to a header tube..
Throwout bearing to pressure plate finger clearance?? I’ve read 1/8” to 1/2”
Where is a good place to start with air gap? From the info I gathered I’m thinking of starting with .050