Clois,
When you install a solid cam in an fe that had a hydraulic cam, you must block off the
oil passages that fed the lifters. if you don't, there will be little resistance to
oil flow resulting in low pressure to the mains and rods which starves the bearings and will eat an engine in 2 to 3 hrs. my guess is your builder did not block off the
oil passages.
Good luck.
Steven