So, I can't believe I didn't ever pay attention to this. I've got a BJYL PCM TBI out of a '94 C1500 in my '77 Cherokee now. When I installed the Moates stuff I removed what I thought was the factory chipset. Well, it reads 'Hypertech' on it. I always assumed that was Chevy's chip supplier or something. Apparently I was incorrect. I've emailed Hypertech just now asking for some background on this thing because the truck runs really well with it in. Better, easily, than the stock BJYL $OD program.