13.3's to 11.8's to Forget it...
Squaring the carb is adjust the throttle plates until the transfer port opening is square. Meaning it is open as much as it is wide. If it don't idle there you will have to drill the throttle plates or it will run rich and always suit up the pipes. Never go beyond square. Start there and close them up if it is idling high. Never open them beyond that point. Again if it idles to low you have to drill the throttle plates. This is only done when adding a large cam with excessive overlap.
The hole drilled as shown in last pic is 3/32
When you ad that 484 things will change with that carb. If its not a 4 corner idle circuit carb you may have to drill some holes in the venturies .
Squaring the carb is adjust the throttle plates until the transfer port opening is square. Meaning it is open as much as it is wide. If it don't idle there you will have to drill the throttle plates or it will run rich and always suit up the pipes. Never go beyond square. Start there and close them up if it is idling high. Never open them beyond that point. Again if it idles to low you have to drill the throttle plates. This is only done when adding a large cam with excessive overlap.
The hole drilled as shown in last pic is 3/32