Update
the shop went with Ford retrofit hydraulic roller lifters and a COMP Cams THUMPR hydraulic roller camshaft p/n 35-600-8. RPM range 1900-5600, grind cam number 283THR7, advance in./ex. = 283/303, @.050" in./ex. = 227/241, valve lift @ 1.5:1 in./ex. = .531/.515, lobe sep. angle = 107...