I Just purchased a 71 360 out of a c body, very low mileage n seems very original. Here are numbers out side n inside. GW360R3618- frt. of block, pass. side, 5-27-71,dri side, 3418496 2 360, crank-3418640-1,rods-3418645- KRY,KLJ,KNL,KNG, two different colored rods??? a 2 copper colored the rest...