If you are talking about the heat cross over, the opening in the center of the head on the intake side and not down the inside of the carb, they it is no problem at all. That is a blind hole around the crossover passage to reduce the heat transfer to the head.

'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60
'57 Belvedere 2dr sedan, current project in process
'19 Cherokee Trail Hawk Elite
'03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong