How much does temperature affect motor?

That does appear to be an older 3310-1 and in fact could be a 780cfm. They were metering block vacuum secondary carbs and were pretty good. I’m looking for info on secondary fuel metering.
Edited to add;
Yup the chart lists it as a metering block vacuum secondary. It should have 76 jets in the back. And under power valve says 12”-13”. Never noticed that before. If you’re tests ok then stick it back in and tune that circuit later on. If it tests bad we’ll have to figure out what it is. Look for a number on it.