I'm having the bottom of these intakes machined, I will probably pick them up in a few days...
Here is a mockup of the intakes, the tubing is ~20mm internally... the round tubing where the carb mounts up will depend on the dimensions you want for your carb.
They'll work with PHBG and SHA Dellortos.
Anyway, I'm thinking $25 shipped anywhere in the US.
For probably about $15 more I can powdercoat it the color your want.