Does my 451 have to small of a cam?

Get it all tuned in if its not. Easiest thing to do for the carb is borrow one if you can for a run and see if that seems to change things up. I would guess that converter is a stock non hp converter i heard they stall around 1800 rpm. You could borrow a converter for that matter too but I would suspect you need more stall.

Also mentioned whats your suspensions set up? You can have all the power in the world but if you cant get it to the ground it dont matter. Did they guy you bought it from ever run it at the strip what were his times and what was it in? I didnt see if you bought just the motor or purchased the whole car and all. The kickdown is hooked up and adjusted properly?