my $.02 is that when companies sell a 383 sb in short block (in this case with scat steel crank, scat 4340 i-beam rods with arp cap screws, hypereutectic pistons, moly rings, machined, decked, cearanced and balanced. Just put cam of your choosing and top in on) for $1750. Or a complete complete breather to pan for around $4k and some have a warrenty people are going with a sure thing in stead of used. Because lots of people dishonest on what a motor is and you pick up a used/rebuilt motor you still tear into it to makes sure its what ya bought and have time and possibly more money so market on used?rebuilt motors is hit and miss craps shoot