I agree that you can check the block codes to find the displacement, but I also agree that you should not buy anything for the engine before ascertaining the condition. In a engine that has in all likelihood celebrated it's 30th birthday at least a few years ago, you do not even know if or how many times it has been rebuilt. It may already be at it's maximum overbore or the crank could have been turned a few times, line bored excessively, etc. You have to take the thing apart to know for sure before you waste money on parts you have no use for and are hard to return. Heck, you may even need to start with another core. If I were you, I'd pull it and take it apart then take the block, crank and rods to a reputable machine shop and see what they say. When I rebuild an engine or have it done, I let them order the parts. That way, if they make a mistake ordering the parts, they have to eat the mistake. Ask around when you talk to other car people as to who does a good job and who does crap. I have a shop I have dealt with for 14 years and I also found another good one around the corner from my house. The old guy at the "new" one kicks *ss and does great work, but I never would have found him without asking questions of other car people.
