Spend the extra bucks up front and get the 440-1 kit. By the time you buy everything needed to install the SRs you'll be close to the cost of the 440-1 kit. The biggist difference between the SR and 440-1 head is the dog leg in the intake runner on the SR. The dog leg is elliminated on the 440-1 by using the off set rocker. Indy dosen't tell you this up front. How do I know this? A friend went with the SR heads last year and learned the hard way. He was a very unhappy camper.