Aftermarket throttle cable

dart_68 said
Just the stock original pedal.

Are you using the appropriate throttle linkage adapter?
The one you need depends on what carb you have, which you didn't mention; but you need it to get the right "throw" with an aftermarket carb and stock pedal.
Edelbrock/Carter: Edelbrock 1481 Edelbrock Throttle Lever Adapters for Performer Carburetors | Summit Racing
Holley & clones: Holley 20-14 Carburetor Throttle Lever Extension
Holley 20-7 Carburetor Throttle Lever Extension
and others...