The power Enrichment valve,
Is behind that round solenoid that hangs under the fuel inlet area,
The power Enrichment valve is held to the carb. body by a triangular plate and three screws behind that Vent solenoid
This Information is all in that 740 Ford Carb manual that I put the link here a few post back
There is another great information resource
Haynes 10240 Weber Carburetor Techbook Manual
Weber Carburetor Haynes Techbook
With a Haynes manual, you can do it yourself…from simple maintenance to basic repairs. Haynes writes every book based on a complete teardown of the vehicle. We learn the best ways to do a job and that makes it quicker, easier and cheaper for you. Our books have clear instructions and hundreds of photographs that show each step. Whether you’re a beginner or a pro, you can save big with Haynes!
What you can learn:
All about the Weber Carburetor including Zenith Stromberg and SU Carburetors:
--Theory and operation
--Maintenance and tune-up
--Detailed overhaul procedures
--Application and reference tables
Summary:
--All popular Weber carburetor types: DAF, DCD, DFA, DFV, DFD, DFE, DFM, DFT, DGV, DIF, IDA, IDF, IDS, IDT, DCNF, DCOE, DFAV, DFTA, DGAS, DGAV, IDAP, and IDTP carburetors
--All Zenith Stromberg CD “constant depression” carburetors: CD, CDS, CDS-2, CDSE, CD-2E, CDST and CDSET.
--All SU type H, HD, HS and HIF (including electronic) carburetors and auxiliary starting devices
--Converting to Weber carburetors
--How to install a Weber dual carburetor kit on an air-cooled VW engine
