Those pistons require the 198 length rod at 7.005 inches. Since this is for a 1980 slant, it has the cast crank, so you must make sure you get the correct rods, which are aftermarket only. The 198 rods will not work without narrowing the big end, to fit the crank. This is not a low buck deal. There are no readily available "off the shelf " high compression pistons for the slant. Best to just mill the head and/or deck, and use stock pistons, to get the compression you want.
