The clutch release fork shown in your photo is from an early to mid 60's truck. it is not correct for a 59 and below vehicle.
It should look like the one Dan posted above.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine