clutch fork replacement in car

Thanks for all the information.
yes it has the 1976 transmission in it. this was the thought for a matching fork. All stock clutch parts. If the fork is to match the bell housing then it would seem I need to start with the fork. I suppose I could always change it back. So people making this swap have used the 1976 style fork if I'm reading this correctly. I probably have the original 1963 fork.