Proper Exhaust Diameter fo a 4bbl 225?

slant six said

Did you put all those bolt ons and cam without woking on upsizing valves ander doing port work? If so you are leaving a lot on the table.

Exhaust recommendations others share is good.
Join the headpipes about 18" or so behind the transmission crossmember.

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I don't know enough about engines yet so the first round and the rebuild were both done for me by an experienced mechanic. I'm pretty sure they went deeper than just bolting stuff on but I'll find out for sure. I'm looking for a local slant six guru that would be willing to work with me on learning the lore so I can start really enjoying the car :).