Call Terry at Manton. They offer 5 different series of pushrods and he can make you a set with .120 or .145 wall 3/8ths pushrods and he is reasonable on his pushrod prices.
I bought a set of 24 degree heads from RFD and Curtis had mentioned to call him for a set of pushrods. I ended up with the Series 5 (.120) wall pushrods for non-guideplate use for under $300. Hope this helps.
http://www.mantonpushrods.com/