[jhv48]

Forgot to mention these things:

The stock sidepipes provided by SPF are extremely restrictive for any engine over about 350 horsepower. Mine had an inside diameter of about 1 3/4 inches. A lot of us have replaced them with aftermarket pipes that had internal diameters of 3 inches. They make a big difference in the breathing and will help your engine (no matter who builds it) develop all the power it was meant to deliver.

Also, quite a few of us with Roush engines quickly replaced the relatively useless vacuum secondary street avenger carb with our choice of double pumper carb. If you do order an engine from Roush, have them install a dp carb instead of the street avenger. They supposedly dyno their engines before they ship them so it should be properly set up for you when you get it. Makes a world of difference in driveability and throttle response.