New to the Mopar scene.. got 68' cuda need help.. new motor...

I was going to say from the video...The sound and slow rev says retarded timing to me. (retarding timing gives more sound in the exh than advanced timing does.) Also, a little safety note. dont ever...EVER look into the carb while revving the throttle. It's a fast way to loose any facial hair, eyebrows, eyelashes, and possibly your sight. Especially on a car that's not tuned right! I've never lost more than hair, and that was a long time ago. But it's one of the most common "whoops" things I see..Second after not using jack stands...