I'm thinking about buying a used 350 to rebuild in the garage at my own pace, so i can still drive my rig in the meantime. Now heres my dumb question,s. I have a stock 350 in my 70 blazer, does it have a 2 bolt or 4 bolt main? Does it matter?, and whats the difference? Is there anyway you can tell without taking the oil pan off and actually looking? /forums/images/graemlins/confused.gifPlease educate me. Thanks.