What size exhaust pipe? Dakota manifold p/n's?

This is close but not the same:

im running in a 66 early A a 74 318 with the 273 manifolds from same car.
I went TTI 2-1/2” “X” pipe dual.
it is super tight. I had to cut out sections to clear torsion bars and around transmission. Lots of fab to make it work and clear and even then it’s tight. If doing again.... I would do a custom y pipe and one single large pipe. How that effects performance I’m not sure. These cars are not designed for dual large exhaust even though we make it happen. Lol!

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