It is recommended that all Head Bolts be replaced when rebuilding One. Original Head Bolts were not the best to start with. I found another Source for these in USA. Headbolts.com.  They sell both sets of Y-Block Head Bolts. Early style with 2 different Length Bolts and later style with 3 different Bolts which were the Ones I need for my Project. They don't ship outside USA so I asked Paul Schroll on this Site if He would help Me and re-mail them to Me in Canada. He did and I very much appreciate His help. Got them Today. Grade 8 Bolts and Washers. Perfect. This will be my last Engine rebuild and using all the things I learned on this Site over last 20 Years. Got a Mummert Valley Pan from a good Guy in UK who bought One and never used it. No more Valley Pan Leaks. Going to use "The Right Stuff" in place of Side Seals on rear Main. I also ordered a new Aluminum Intake off Ebay. Exact duplicate of the ECZ-B Manifold. Not meant to be Hi-Performance. Just a stock Intake which weighs MUCH less than the Original. Going to be a Nice Engine when finished.