Idles very rough and turns off

Installed Yella Terra Roller Rocker Arms with a 1.9 ratio. The stock rocker arms are 1.6 ratio. I followed the instructions as best I could, torquing the rocker bolts to 25 ft lbs. Also the new pushrods are 7.3", and are 1/4" longer than stock, which is meant to compensate for the higher ratio. As soon as I turned it on, it immediately idled very rough, erratic and loud. I turned it off after like 5 seconds. I turned it on again, but this time it turned off on its own after like 3 seconds, and it made a loud grinding noise. After that I didn't try to turn it on again. The only odd thing I noticed after installing them, was that the bottom of the rocker arms, right below the pivot was sitting tightly on the new pedastal plate, whereas the stock rockers do not contact the pedastal plate below the pivot. The instructions did mention that some spacing shims might be needed between the rocker arm, and where it bolts into the head, but they didn't come in the box. Everything else is stock as far as internals go. Once I torqued the rocker arms, I was able to freely spin each pushrod, but they didn't have any up and down movement. Need to know if this is normal when installing aftermarket high ratio rockers, or if I might have done something wrong. Thanks.