Please Help with my 66!

Before you go to the work, what is the parts combo on the 302? What is the expected power level? Ford upgraded from the SROD to the T-5 when power went up. The extra gear was good, but the easy to bend shift forks, then not staying in first gear, and synchro damage stunk in my 79. After it was finally repaired correctly, I usually granny shifted.
Factory was a cable linkage.

And check out the recent posts from @CarMichael Angelo to see adventures on a hydraulic clutch bearing conversion.
https://www.stangnet.com/mustang-forums/threads/1978-fairmont-carnage….917938/page-112#post-9316518

Why would it need a hydraulic conversion kit? Just because someone says it needs one doesn't make it true. I mean, I am all for hydraulic clutches...but they certainly aren't "needed" to actuate the clutch. I wouldn't use the SROD unless you have no other choice...either a T4 or a T5 is a better choice...but a cable clutch should work just fine with a SROD aside from possible header clearance issues(depending on headers)