675 at the crank with a small block from the 80s or 90s is not likely with a stock casting 350 block, stock ported heads and is that a quadrajet I'm not a car guy.
A friend just made 750 with a stroked 42x dart little m, aftermarket heads maybe Brodix, and he 's running a 1050 custom built dominator, and running something like a 2 1/8 step headers into 3.5" primaries.
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