Who's running a Weber?

Sounds good. Be sure and get a fuel pressure gauge so you can see what you have there through entire operating range. I would suggest beginning at 3.0 PSI, as pressure at needle seat and fuel level in fuel bowl will fluctuate depending on load and RPMs as you increase / decrease engine speed. Even more so if you retain the mechanical fuel pump.

Its a balancing act. On the one hand, you don't want to exceed max fuel pressure of 3-1/2 PSI but on the other hand, you don't want pressure to drop too low when you open the throttle a lot either, as float level and resulting fuel level in float bowl are critical to proper operation with Weber carbs. The saving grace with the 38 DGAS or DGES is that it is fitted with F-50 emulsion tubes and they are pretty much 'neutral' from top to bottom as far as diameter of tube and spacing & sizing of holes.

Good luck with your new carb. Look forward to hearing how it works out on your engine.

Best regards,

Harry