It has been quite a few years since I used leMans rods, but I seem to recall unlike other stock FE rods, the LeMans rods are lacking the oil squirt notches at the big end, so the Lemans rods were a bit narrower, with more side clearance. Also, many years ago, I helped a local racer with his Super Stock 396 Camaro, and he spun rods bearings 2 weekends in a row, and the problem was excessively loose rod side clearance. Once he replaced the crank and rods, he never had another such issue.