This thread is ALL over the place. Your type R cams are already pretty decent. I would just leave them in and save the $500. What are the JUN internals? Retainers and springs? Someone dishing out bick bucks for JUN retainers and springs for type r cams is a little odd in my book. I'm not to familliar with putting a type r head on a B16. I thought b16's have awesome breathing heads from the factory. As for spending more money on the b20 block and a crx is all up to you.