You'll be much farther off running 40 year old stock rockers and the injection than you will spending the big bucks for fancy rockers and topping it off with carbs.
The motor won't notice the difference the rockers make but boy will it run better, stronger, cleaner and longer with the injection.
My next build is using 40 year old NOS wide pad rockers and the injection, I'm selling all my Holley and Carter carbs so I won't be tempted to use one ever again.

Sheldon