Hey Bryan,
Yes, the same plate will work for both size carbs. I agree too with the "sausage" type filter for better clearance but it costs a bit more than the square cut one. Nice rendering.
I noticed your attachment picture-Do you have the ITG baseplate in a drawing cad file I can get from you?
Thanks,
Mike
The file Bryan posted came from me. It was used to make the backing plate for my '67 GTV with 2L motor. The file is in Adobe Illustrator format (CS2, I believe) and anyone who wants a copy is welcome to it. Just send me a PM with your e-mail address.
I made the plate by first scanning a borrowed ITG backing plate. I then modified the ITG plate by moving the mounting holes a bit to give more room between the firewall, fender and air filter. It took a couple of tries to get it right, but now everything fits fine, at least in my GTV.
One thing I learned during this process was the importance of having a backing plate that is stiff enough to hold the carbs firmly in place. The new plate is made of stainless steel. I believe the material is .090" thick. The first plate I tried was from Pipercross. It is so thin it is useless and occupies a place of shame on a dusty garage shelf. The ITG plate was sturdy enough, but I wanted more room around the filter.
The rounded ITG filter you're talking about is part number JC50/S/75. You can get them from
www.coastfab.com. There's a good photo of my engine with that filter here:
http://greend.com/alfa_engine_carb_side.htm. This is the filter an ITG manager recommended to me, after testing it with a set of air horns like the ones I got from TWM.