I had worked at Hank the Crank in ca and we did build Flat cranks for guys like Ryan Faulkner race engines and Traco and Chaparral. The crank u have looks like a billet to me with center counter weights. If to check on the front counter weight it will tell u the stroke and both rod and main sizes if it’s a HTC crank. Also looks like a Avaid oil pan Weaver Dry sump and Norris stainless steel rockers and maybe BBC push rods. All the people I mentioned were in the Los Angeles area. As far as “0” dash # goes the parts that I have from Jenkins had the part in there box an the new GM # after the 0
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