273 hydraulic cam/pushrod/adjustable rocker combination.

Usually bent pushrods are a side effect of valve float. May want to pull your lifters and check for scuffing or irregular wear. Check rockers for lateral movement, may need re-bushed, replaced. Get a pair of adjustable length checking pushrods, set up rockers with 1-1/2 threads showing from under rocker, install set-up and adjust pushrod length for around .020-.030 of lifter preload. Check at least all four corners of engine, cylinder number 1,7,2,8. Bear in mind lifters preload usually between .020-.060, so you have some leeway. Order pushrods set for that length or get a cut to fit set, if available, your preference.