Mopar 360 Performance Shortblock

They must be hit or miss cause I've read so many guys have bad luck with them but this past Sept. at the Monster Mopar weekend I talked to a fellow that was running one in his 68 Cuda and he said he'd been racing it for 4 yrs. now nearly every weekend and it's still going strong. The amazing part is he runs 11.80's with it. Maybe his was built at Cummins.