I will be doing a resto on a 72 Demon 340 H code car and have a question as to engine block. Car will not be a total OE resto but I'd like to get as close to possible as money takes me. I have two non original 340 blocks to use for this build...1/73 warranty block no VIN# and a 5/72 block with incorrect VIN#'s. Which do I use and/or do I mill off VIN's. Thanks for your replies! Rick