ET Report Card on the Speedmaster Heads

8.33 at 82... Thats pretty decent for what you have there! A friend of mine has a very similar duster with a store bought low compression 360 but put his ported magnum heads on it also runs 8.30s with a 904 and a 3.23 8 1/4. His like yours is daily driven in city traffic and will put the hurt on most unsuspecting sports cars any given day. Looking forward to seeing how those heads respond to a cam change!