I am sending two 350 4 bolt main blocks to the engine shop to get checked out. Hot tanked, etc. Once I talk with my engine guy about what I have there for bore sizes or what not then I need to make a decision as to what block to go with. I know that some blocks had higher contents of certain metals that people say made them stronger. I believe one of them is a 020 not sure of the other. I will build the better block. Forged internals. Low compression somewhere around/at/or below 9:1. (any advice, anybody?) Cam??? I have heard Nitrous cams are good for this setup (Totally unsure of right now) Good set of Aluminum heads. Then I will need front accessories again such as alternator and water pump as I sold the others. Also starter. decent headers from which I received the part number from Branbell (thanks!). Still unsure of whether or not I will go 4 speed or 400 trans. That will at least get me headed in the right direction.