Hello, Im new to this computer forum stuff so excuse me if I put this in the wrong spot. I have an 89 accord LXi that I bought a junkyard head for. After hot tanking the new head I noticed that the casting numbers were not quite the same. the original head had a number on the exhaust side PJO with a HF7 underneath. the new head has a PJ0 with HF8 underneath. Are these two interchangeable? I notice that the cam cap on the distributor end is different; however I should be able to swap those out. Are the cams different? my car is injected and I believe the donor car was carburated. Any help would be greatly appreciated. thanks. tim