Hello, my name is Markus from Germany.
I want to convert my Holley #4777-6 4150 double pumper carburetor to electric choke.
There are two different e-choke conversion kits, 45-223 & 45-224.
The 45-223 kit requires an internal vacuum source.
The 45-224 kit an external vacuum source.
Which kit is the right one? Thanks, Markus.