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why are you swapping the 383 for the 440?

I dont understand the conversion but sticking with the choked down exhaust system?


My 383 is tired, so I pulled a 440 out of a donor C body Im rebuilding and will bolt in. My 17 year old is springing the cash for the project so the cost needs to be spread out over time. We can spend money on the manifolds and exhaust later.