The first description points to a 2bbl carb, and depending on your speed/rpm at the moment you floored it could be considered normal.
If the TC jumps to 3300 from 3000 that is about 10% slip and could also be considered normal.
Therefore, I would get a second opinion on either the tach or the speedO. Either the trans is slipping or One of them is a liar. And I really doubt your trans is slipping; Cuz your TC is right at 10%. This might be a little high, but you can't get to 3000 from 2461 with that TC alone,cuz this is a 22% slippage factor.So that would put the direct clutch at 12% slippage. Transmissions,don't slip 12% and then suddenly stop slipping, at that 12%.
So I'm sticking to a liar in the hen-house.
Here is your speed to rpm formula.
(65mphx1056conversion factor x2.76gear)/ 24.5tire height x3.1416 converts to tire roll-out =2461rpm at Zero-slip.
Depending on the power the engine makes and the drag on the chassis, Your actual observed rpm could be a few percent either way from that. I estimate from 2400 to 2580. Unless your engine is in a really,really,poor state of tune, then a maximum of 2700.
That's my best guess.