How much does temperature affect motor?

When tuned properly, a carburetor will be way too lean to keep a cold engine running. Which is why we have chokes. Or if you don’t have a choke you have to feather the throttle on/off for a while until the heat in the intake runner, plenum, chamber etc can vaporize the fuel. The same can be said for an engine that gets heat soaked. I suspect you have some carb tuning to do assuming your ignition timing is reasonable (12-18 initial and 32-36 all in) and stable. Take a look at the plugs and report back. My first instinct is to tell you to return the jetting back to what Holley sent with the carb and work on idle and transition fuel. After that you can focus on WOT.