Are you running the full Procomp Topend Kit (Heads, Intake and Procomp carb)? If so I am doing the exactly install this weekend. What length push rods did you end up using?
I have that exact same kit. Except I installed mine with the motor in the car. Not fun at all. I used the stock pushrods with the ball cup ends. When I bought my 340 X-heads they had adjustable rockers and the matching pushrods already. It is possible they are stock 273 push rods, but I don't know for sure. I would be happy to measure one and take a picture for you.