For testing only, Cut one of the stock pushrods at point where you can get to the cut once its in the engine. Remove 1/2" to 1" of material and weld a nut to each of the piece. Thread in some all thread or any type of threaded rod and you now have a adjustable pushrod. Once you have it in the engine, its just a matter of turning the two pieces till you get the length you need. Then when shopping for true pushrods, you have a good idea of the range you need.
Joe
