Correct Carb Spacer?

Have a performer intake as showen with a "square" bore Holley Carb. At this time I'm also using a square bore "open" spacer. Should I be using the "four" hole spacer? and does it matter? As it stands now, I don't seem to be having any fuel mixture problems but would perfer it to be correct.

PS These red adaptors are just examples!
Thanks