how to identify holly numbers
 

I've got what I was told, and looks like a holly 650 double pumper, its been sitting for two years and I need a rebuild kit but I am having trouble identifying what one I need there are tons-
the only numbers anywhere on it are 6R-55345 or 11166

once I get that I also need to figure out what size jets I will need, it was tuned for drag it's a 12a with extremely large street ports set up draw through a t3 turbo- it only wants to run right at high rpm but I'd like a much broader range