How much does temperature affect motor?

TT5.9mag said
3310-1 is a 750. Take a look here
https://documents.holley.com/techlibrary_carb_numerical_listing.pdf
And it will tell you everything about it. I would return that thing back to completely stock and start tuning from there. You have no idea what has or could have been done during all the years of rebuilds.

Am I reading the chart correctly? My carb should be the R3310-1 At the bottom of my cropped photo?
I will study this and do my best to return everything to its original form after I get a chance to warm everything up and test for vacuum leaks

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