Correct Fork, bellhousing, clutch for 1969 Camaro

[66cayne]

I am having some trouble with my new clutch install. My install is an Muncie M21, '621' bellhousing and 11" clutch behind a 350 sbc. The fork I have for this is the ( 10.4 "in length). when installed it will not center the throwout bearing on the clutch diaphram fingers. After researching this problem I was advised that Chevy used two forks in '69 based on the clutch size/bellhousing used. Theey are: # 3892632 and # 14066235; Per the information I received, clutch fork # 14066235 (which measures 11" in length} was used with the '621' bellhousing and 11" clutch when installed on the higher horsepower 350s Camaros { like a 350/300 hp in an SS}. The # 3892632 fork was installed on other sbcs and ironically the 1969 Z28 as well. If anyone has can shed some clarity on this subject it would be much appreciated. Regards