I want the extra power but I would like a low growl rather than something too loud... it’s a 1954 235
Where is this "extra power" supposed to be coming from? With a cylinder head design from the 1920's, the only thing a dual exhaust system adds is another pipe and muffler to rust out, and a lot of extra expense. The constant ringing in my ears called tinnitus makes me wish I'd been kinder to my hearing a few decades ago.
I have invited several people to show me chassis dyno results of power they added by installing the popular dual carburetors and/or dual exhausts without making extensive internal engine modifications, and so far nobody has been able to document the alleged improvement they were looking for.
Jerry