I purchased replacement head bolts from Fastenal. They were 7/16"-14X2&1/2" yellow zinc finish SAE j429 Grade 8 Hex Cap Screws Part#0115163. The was cost $0.896/each. All the head bolt holes were open into the water jacket in the three 8Ns I have rebuilt. If any hole looks blocked dig around and see if it is not just years of corrosion. I used a washer only because the head on the new bolt was not as big as the original and I liked the look. The washer from Fastenal was a 7/16" yellow zinc finish SAE Tru-Hardened flat washer Part# 1133816. The cost was $0.1912/each. I used Teflon paste seal on all bolts. I did not cut anything off any of the bolts.
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