Okay just my 2 pennies here but the Roush 427 R's cam is not (in my opinion ) as street friendly.
What are you planning on doing with the car? If it is a street cruiser I would suggest the 427SR/Tw it is very well mannered for the street and the power comes on heavy at 3000 rpm!
I get 10-14 MPG with mine with the tko 600 5speed, if you find you want more HP later you can always upgrade to the injection set up for better throttle responce and roughly 40 more HP.
Marc
