70 dart swinger slant turbo build and mild restoration

Ok so messed around with it a little day I really need to find what the dimensions are on the stock ports or close to it so I know what size pipe to use an whether to fit it inside the flange or butt it up against the flange this time I bumped up to 1.5" schedule 40 pipe I'm thinking my original plan of 1 3/4 schedule 40 pipe is what I'm gonna have to do. Everyone look around and see if u can find any dimensions for port size so I don't have to pull my car apart. This is with the 1.5 stuff