just pull back just before the pistons melt in to the oil pan:3dSMILE: if you have 10 on the crank and 26 in the dist then its 36. or 12 on the crank and 24 is 36 good place to start go to lighter springs to get it all in at 3000 or lower 2500. this works for me and have set up many this way this works i would not run 40 on it should not need that much . if you have a MSD they are very easy to do .what do you have ?you can pull 50 but will help around town but you do not need it under aload:eek: