Usually you can get away with stock pushrods, to a certain extent. .120 just seems like a lot off the block. I believe you can take up to (or more than) .100 off the cylinder head as well. If you want high compression.
I just did 0.100 off the deck and it's still in the hole a good bit. (but i was afraid to do more on this engine.) but I did the head 0.060 with larger valves. I'll clay it up and check things when I get more down time.
