The L/S ratio for 331s and 347s can be improved greatly my moving the pin up in the piston behind the
oil ring, but we're talking custom pistons, aka, high price. You can get away with less than a 1.7 ratio, but I avoid anything under 1.7:1 for a racing engine. Not only is side loading greater, instaneous pistion velocity and forces on the pistons are greatly increased. Piston wear and failure are more of a threat that is cylinder-wall failure.