You're going to have to check piston to valve clearance with some clay. After all, you spent a lot of money to not check the clearances. As for pushrods, you only need new ones if you're running guide plates or the rocker arm geometry is not correct. The roller on the end of the rocker arm should contact only the center of the valve. If it doesn't, you'll need to get proper length pushrods. Even if the geometry is correct, I'd get a set of new ones, that way everything will be new and fresh.
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