Maxilo, I am doing an HO, but as Pinionhead and HO said on #'s, parts & cost..... If not hung up on matching numbers and dates, any early 70's 2 bolt 455 will be already drilled for 4 bolt, and rather than a spendy & hard to find "HO" block, 4 bolt caps can be added to a 2 bolt block (what I did) on a YC 1971 block (align bore rqd.). I spent 2000 on 71 HO heads and 700 on 71 intake. Had block and all misc parts also. I expect to have $6-8000 in build maybe when done on top of heads & intake parts cost, so 10K engine ballpark maybe. Forged psitons and rods and roller valvetrain is almost half of that cost. A "stock parts" build could be substantially less. Yes I will have a "mutt" engine but do not care, it will make equal fun as any.
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72 Bird
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