Actually the 16V71 was 2 special built blocks bolted together with a 2 piece crank that was bolted together, It was designed to make replacing parts as necessary cheaper. But... The alignment tools to line up the blocks and cylinder heads were not cheap. And depending on the governor used, they were a total PITA to set racks on.Are those two 318s back to back? Probably pull a 4 bottom with much difficulty eh?