I'd put in a diaphragm clutch, not a 3-finger long throw clutch, much easier on the leg. And remove that huge "assist" spring under the dash.
I have the old 3-finger with a full roller/hemi-joint z-bar clutch mechanism from Opentracker (https://opentrackerracing.com/produc...-1970-mustang/
), removed the assist spring, and it is great.
Warning though, if you're going to use your old flywheel be sure the bolt patter for the new clutch pressure plate matches the bolt holes on the flywheel. There are three different patterns. New flywheels are usually machined with all three patterns giving you options.