Breaking in a race engine?

I think you would benifit greatly with lower gears .
I would go with a set of 3:91's
I think you could benifit from a different intake manifold ?
I had a 284/484 cam in a 70 340 duster and it pulled really hard !
Never got to track test it ?
My buddy had a mid 13 sec Camaro he said my duster would beat it ?
I started with 3:23 gears then 3:55 next 3:91 then last 4:56
4:56 was to low but fun from 0 to 100
I think 3:91 were a good match .
What distributor are you using ?