Here's the instruction sheet with the pushrod specifications.

I think I may have mis-read it. They specify an adjustable rocker arm must be used with the pushrod length of 7.375. I have found two different instruction sheets for these heads. One says the stiock rockers are OK and the other says the adjustable must be used. I'm going to go adjustable to eliminate any future problems. Fix it all now and hopefully I will be good. I have never dealt with anything other than the stock stamped rockers. Im a bit iffy on what rockers and lifter combination to use. I know I will determine push rod length after the rockers are installed. I know the 273's are inexpensive but what lifter to use with them? One person says Hydraulic are good and someone else says they aren't. I don't want to spend money on something I don't really need. Rockers, lifters and pushrods are expensive. I wan't to do it right the first time...Unlike my current situation...