I have four of the pictured intake manifold bolts and all the rest have either Z or N on top, just plain flat bolt heads or have three lines from the middle out. All are otherwise flat with no raised edges. The motor is a '68 350 SS, numbers matching and I want to keep it as close to original as possible, but I need to know if the pictured bolts are the ones I should locate, or if I should go with reproduction "M" bolts. I've read different threads on here about which bolts were correct for BB's but there were no definitive pics for the SB guy.
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