I had a glass fuel filter on my 1405, which I also have in-line with my 1901 Edelbrock. I have not had any problems related to the fuel filter.
As far as those two idle mixture screws are concerned, you can go to
www.edelbrock.com and search for the owner's manual for your carburetor. In it, you will find all of the instructions for adjusting your carburetor, as well as other tuning tips. My warning to you, is the same I tell everyone: when you turn those two screws in, be careful not to allow them to bottom-out with sufficient force to cut grooves in the tapered tip. If you do, you will have a buncha trouble getting your engine to idle properly.