3 speed or 4 speed bolt to the same bell housings. I think you have a 552 or 553 bell housing that you that I see in your pictures. (the number I listed are the last 3 numbers on the bell housing part number that you see after you remove the 3 speed). Those are original part numbers for the stock cast or aluminum bell housings.
Your clutch linkage should be the same that you have with the 3 speed.
You probably have a 10 1/2 inch clutch which is the stock size for 62 and I think 59's. Use of a 11 inch clutch requires a flywheel that will has a mounting holes to fit that size clutch.
Nothing wrong with a 10 1/2 inch clutch unless your clutch needs replacement.
Your driveshaft should be balanced with a new front and your existing rear driveshaft section to eliminate any possible vibration when you change the front section to fit the shorter 4 speed length you need.(25 1/2 inches as I recall.)
I also install a billet driveshaft support that is sold by Inland Empire. I think the ones I bought from Eclkers come from Inland Empire (they have the quality billet carrier). This link:
https://www.lategreatchevy.com/full-size-chevy-driveshaft-support-bearing-heavy-duty-1958-1964.html
or Show Cars biller carrier
https://www.show-cars.com/cgi-bin/commerce.cgi?preadd=action&key=6668
Paul