Reply to "Holly ultra issues"

Kristian some thoughts, in random order (like most of my thoughts):
-Can you move your fuel line away from headders/heads/intake, so it doesn't boil?
-When Hustler suggest pedal 1/3 down so acc pumps don't come into play, they do, acc pumps work immediately, so when clearing up a rich condition by opening to reduce vacuum, wait patiently for fuel to evaporate, keep foot still
-Sometimes a hard starting car when hot has timing wrong, one of Erik Bossing's friends in a Mustang came by me, had tried everything, adjusted idle timing, no more starting problems
-Should you be happy that the engine comes on so strong at a high rpm? Probably not. My Pantera was like that when I first got it, very entertaining, but allow me to quote from my book:
"One comment on how a car feels: A car with too much carb and camshaft may feel very powerful the first time you try it, because the power comes in when you reach 4000-5000 rpm. Suddenly you get a kick in the back. It can be a lot of fun; it feels like you suddenly have two engines. But that’s actually a bad sign; it means that the car has too little power below the rpm where the power finally kicks in. An engine is an air pump that, based on parts choice, has a certain max HP. As I’ve stated before, the best (i.e. fastest and most fun to live with) car will have that power at all rpms. The car in this example has lost that below 4500 rpm, and it does not have extra power above 4500 rpm, it just has the type of power it should have had all throughout the rev band. Engines’ power does vary with rpm, that’s unavoidable, but if power comes on very suddenly at a certain rpm, the engine is not well-tuned and is losing potential power below that rpm."
-Float level OK?
-I doubt clearing slots would do a difference

Here's what I would do. I would start all over adjusting everything, ignition and then carb. And I would play with the timing curve so I got power at low and middle rpm as well.

You're welcome to come over one day if it doesn't get you the result you need...