Carb spacer

The fuelling issue really showed its head this weekend....long story short
Was running high 11's in 1/4 but dropping pressure from 9lb on first 1/8th then right down to 2 in the 1/4
Then on 3rd pass started bogging hard and dropping pressure irraticly and I was starting to run low 12's
Then ran bad......did a pit fuel filter clean and it's blocked, so I'm going to replace. The whole lot.pump, filter and line.

So back on point, I think iv needed bigger line due to the pressure drop in the back end
So what I want to do is make sure I'm getting as much everything evenly in that second half
So with line increase etc what advantage is increasing height on carb?