push rod length help

hey guys i could really use your help. i am building a 408 for my scamp and i am using an early 90s 360 roller block but has the oiling provisions for LA style heads. i am running a hughes hyd roller cam and mopar hyd roller lifters i have comp 1.5 roller rockers on my LA style eddy heads. i have measured my push rod length with the checker sent to me from hughes and i have it set it where i have a good contact patch for the rocker right in the center of the valve, over the entire lift of the cam. but my problem is that the push rod seems short to me. it is accually shorter than the factory magnum push rod and much shorter than a factory LA push rod does this seem right to you guys i have never used one of theese "hybrid" blocks before and just wonderring if i am in the ball park o this