I believe that was before decent fasteners where available.
Bill Jenkins had the register moving apart thing figured out back in the 70s he would take the dowell pins from pontiac engines and use them in the 2 bolt 400 engines that he was playing around with . He called them tire test engines and match race motors. Bill would install a dowell pin half way from the register in the block to the main bolt hole to keep the cap in the register, and he would use factory fasteners where ever he could he climed the stretch was the best on the gm bolts
Before ARP came along SPS was the rod bolt to buy, and GM made some great rod bolts as well called Boron bolts. The SBC was a lighter crank compaired to the 90 pound BBC. Yes we spun 283,s and 327,s 350,s to the moon, dowel pins work to a point but not well in BBC with the heavy cranks. Along with GM Ford made some great fastners as well.
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