My advice would be to replace the composite gear with a new aluminum one. A bit noisier but a lot stronger. I believe that all 55' and newer 235 engines were cross drilled for hydraulic lifters whether equipped with them or not.
I just rebuilt mine and used hydraulics with the new cam because I don't like to listen to the clacking of solids unless it is a full out race engine. Also I intend to drive it a lot and don't want the bother of adjustment.
