I found a Weber 38/38 for sale by me for pretty cheap but can't find any info on anyone using it on a 12a. If anyone has and could give me some info on installing it that would be great. Also this is my first car with a carb so I'll have a lot of questions.

 

Sounds like a DG type of Weber, and I don't think there's a compatible manifold that will mount up to any rotary. So that would be the first thing to sort out.

 

I think the dual webers were 36/36 and I'm not sure how the 38/38 fits or works on a 12a. Like mentioned above, you will need the manifold and that might be the hardest part to find. Good Luck and post some pictures of it if you get it.