Would anyone be able to tell me what size Dynamix carb came with the .91 ? Thanks

I'm also looking for dimensions of the carb adapter for it, mainly the collar height and what size set screws. I've only seen general pictures of them. Is the inside stepped to match the carb bore diameter?

I am also starting to look at drilling my cases to accept bolt-on headers and wondering what the center to center distance the factory drilled them at. Mac's Products has some of them but not all.

below is my .91 that I am asking questions about. Its a marine version I am restoring from new. I just got a fuel pump for it and seeing how it fits. I would like to try it with a Dynamix.

Does anyone know what the red anodized Dynamix is all about? Is the red cover plate and filter just a filter or designate a specific type of carb?