Simple DIY Mods Factory Cast Intake * Spread bore to Square bore

Totally and completely 100% unnecessary. All you need is this.
Carburetor Plate

Most O'Reilly stores keep them in stock.
That exact piece is in the video and is what I am using. That piece alone will not allow you to install a square bore carb on that intake without modification. I demonstrate this in the video, the front butterflies hit the divider.