Video of it running

I swapped my i6 to a fully rebuilt 302 in my 67 mustang coupe and it sounds like it is revving way to high. Do I just need to tune my carb?

 

I couldn't access your video but if you mean it's idling too high, then yes, adjust your carb.

 

If you haven’t done an initial setup of the carb, then yes, you need to do that. If the car was idling okay, and then started exhibiting the increased idle speed, then you need to look for a vacuum leak somewhere. Could be something obvious, like a hose off, or could be on a gasket if not so obvious.