273 stock , what mufflers for duals ?

Smokey, we tested several of the non stainless steel XLERATOR mufflers and if they still have them, the 18" long body version is perfect for the A bodies and is much quieter and to me, better sounding than the 14" ones. They used a different perforated tube pattern in the 18" long ones. They are every nice mufflers.

I think 2.25" is the smallest they make and sell.

I still have one cutaway of the shorter ones if you'd like to see it later. I can take some pictures of it and share them.