Pipe shape and volume are specific to engine size. The restriction in the pipe is tuned to the engine so that the exhaust pulse from the cylinder hits the restriction and rebounds at the exact time that the fresh fuel/air mix is coming out of the cylinder. The rebound is necessary to shove the fresh gas/air back into the cylinder so that it can be burned.
Using an improperly shaped pipe will not give optimum performance and in some cases, can cause damage to the engine because the rebounding exhaust pulse doesn't return the fresh fuel/air back into the cylinder. That will make the air/fuel mix lean, which can burn hot enough to melt holes in the pistons.
The 01 600 is also a small block engine, the 700 is a big block engine. I'm not sure the manifolds for the small block will even bolt onto the big block.