Why do you want to know? If it's for header fit on a 69, all the PS boxes are the same from my research. Many of the headers won't work with a PS box unless you dent the pipe or grind on the box to create some clearance.
On a small block - Dynatech is the way to go as they don't have clearance problems, can't comment on the big block fit but I would check them out if you are concerned about fit.
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