[25stevem]

It's not so much a question of decent needles and seats it's the diameter of the hole in the seat.

The bigger the hole the less pressure it takes to open the neddle due to the increased surface area.

A small neddle and seat even through it flows less fuel per minute, will stand up to more pressure.

Another important consideration is that the less pressure you are able to run, the less airation will take place with the fuel as it's dispensed out of the needle, especially if the type of needle(s) that hang off the air horn of the Carb.

Fuel that has air in it will not only boil off faster out of the Carb, but at full throttle and high demand rates lean out your air to fuel ratio at the time when it can do the most damage to the motor!

Many times with a Carb when crazy rich jetting is needed at fuel throttle, yet the O2 sensor reads lean, this is the reason why!