I am putting together an original 361, and want to keep it all original. I know that 440s,383s are a better way to go per dollar spent, but I am a little different sometimes. The heads have had 1.74 exhaust valves installed and all new valves. I am going to run a Lunati 60304, .513-.533. The proper springs are there. My question would be on porting. I am going to do it myself and am asking for advise from those who have knowledge in this area. Please don't tell me to change to a different head. This 361 will be stroked to 450 but look completely stock and is going in a numbers car. Thanks in advance.