1965 valiant 225 timing issues.

Stock carb wouldn't have an idle jet, but it does have an idle mixture screw. A lot of the time a sitting carb may be gummed up, although if you can see the accelerator pump spray it may be worth just trying to use cleaner in the fuel instead of disassembling and rebuilding the carb. Have a look at the factory service manual; it covers how to set the idle speed and mixture.