A lot of people think you have to have a converter so tight it's a complete turd on motor. I had Alan Pope build me a nitrous converter that's good for a 300 and works really good motor alone. Yea. it's a tad tight for motor, but nothing like my big nitrous converter is.
A good converter guy can make you one that's a good combo, but nothing is perfect for both. A small shot of nitrous is the cheapest hp you can buy and small shots are really simple to tune and use.