I picked up a Mercruiser MPI setup to use with the big block 496 Ill be building in the future. I am going with the big oval iron heads, 781's or 049's. The ports on the MPI intake are rectangular. I understand that they should be port matched, ie. the transition from the intake to the head should be as smooth as possible. What can I do here? Is there a Mercruiser MPI intake with big oval ports? Does it matter all that much for the motor I will be building? I'm not going for a super high horsepower ripper, just a warm 496.