push rods

I totally agree with Dusterdon. You can get rocker shaft shims from Mancini. Adjustable rockers are very forgiving in this situation. When ever you cut a head or deck a block, it puts a "squash" on the pushrod, effectively making it too long compared to the original relationship. You have good rockers and they require special pushrods and I am assuming that is your next step and want to order the right thing to begin with and that is smart. If possible, you can check for proper geometry using the original rockers, shafts and pushrods. The big concern is the rocker tips contact patern with th valve stem. Actually you only have to check one valve. I use the intake on number one and I use a solid lifter to avoid a false reading because the lifter plunger sank down when the shaft is tightened. Rotate the crank and watch the rocker tip action on the valve stem as the lifter goes over the cam nose. The idea is for the contact to stay near the middle of the stem. If your does, stock length pushrods will be fine. As Dusterdon said, shimming the rocker shafts will also work to restore the relationship.