You could just let the fast idle cam fall to its natural gravity induced position, adjust the hot idle and let it go for now. Without the linkage in place, you won't have fast idle when applying choke.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy