OK now lets throw another wrench in the spokes. The original head bolts seem to have a pilot shoulder under the head. A diameter larger than the shank. This would be your centering feature. If they all go in before any are tight, then this would align the head to whatever they wanted aligned. (for the gasket, passages and mechanical features). So actual 235 bolts should be used, I think, for this alignment feature and they would be correct lengths. However they do not seem to be available except used. Don't think original used washers with the shoulder bolt.. They will not hurt anything if you are using them as spacers, and a normal bolt.
