I recently purchased a 1970 40 with a SBC that is in serious need of a tune up. Unfortunately all the PO could tell me about the engine was that it was a 327 and that it was rebuilt about ten years ago- he had no idea what it came out of or even it was still in stock configuration. At this point I have no idea where to set the timing, and was hoping that someone could give me a procedure for figuring out the correct timing on this thing.