I know you might be a little upset with the numbers. But, keep this in mind. Those are still really good numbers. Your probably making 83 more hp than factory. I bet it's fun to drive as well.
Reminds me of a guy in HS. He had a 350 Vega. I had a 70 Charger. He used to say oh you have a Slopar. And I would just think to myself. You can only dream pal.
Mounting and performance is the same as every other 440, the only thing I have ever heard diffrent is thiner cylinder walls,so If you have to do an over bore know or later you can't go quite as far over as the early model 440's.