You should check the numbers as stated, but your friend may have a bit of a Frankenstein version of the 215. The Oldsmobile version did have the extra head bolt per cylinder, (4) per side toward the intake side of the bore. The Olds heads were unique, more of a true wedge and higher compression. The Buick and Pontiac version were similar with four fewer head bolts. Buick and Pontiac heads would work on the Olds cast block.
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