69 Formula S 383 Clutch Question.

Bought my original 383 4 speed car a few months ago from a FABO member (great car)and have been getting it road worthy. Years ago he mentioned he smoked the clutch a bit. Doing ??? Not sure. As I drive it, it hooks fine in all gears but first. In first if you dump the clutch it really doesn't hook well and shakes pretty hard. I priced a Mcleod setup with Brewers but just want some opinions on what I'm seeing. I'm kinda surprised that it pulls fine in the rest of the gears if it's truly slipping much. Car is very drivable as is, just won't smoke the tires. Pedal is adjusted so it engages/disengages fairly high up on pedal release.

BTW, also has 3.23 sure grip gears.

Thanks!!