Another 1405 vs 1406 thread

Hysteric said
Looks to be the same secondary booster discussed here:

Speedtalk Edelbrock 1407 thread

It would be advisable to try and get a hold of the earlier pre Federal Mogul Carter 600-625 carbs for comparison.

Hysteric

I wonder about the hybrids that Edelbrock first made that still had the Carter number, but had the Edelbrock name plate. I have one runnin happily on my truck but I ain't tearin it apart. lol