I totally agree with Mad Dart and RustyRatRod on the timing #'s. Big cam means lower cylinder pressure so it needs more initial timing. Geo you might have been building fast cars for 30 yrs. + but so have I and Rusty and find every time that more initial timing makes for a cleaner idle and snappier response in something with a cam like this. Not sure how long MadDart has been doing it but I know he has built some real fast cars and found it works that way too.