I purchased a set of Scorpion bridged roller rockers for my 401 (3220502 heads) fitted with new Compcam lifters. Of course when I went to use my original 7.794" AMC pushrods, they were a 1/2" inch short. I made up a custom adjustable pushrod to determine the new rod length. I'm getting 8.250" which gives just slightly over a 1/2 turn of lifter preload. Has anyone installed non-adjustable Scorpion rockers and what pushrod length are you using?