With a "mixmaster" engine such as yours, the only definitive way to identify the cam (not the lifters) would be to degree it. The acceleration ramps between the base circle and the beginning of the valve lift at each lobe is different- - - -hydraulic cams have a very short areal of transition, about .003" to .OO5" over a span of about 5 degrees of rotation. A solid lifter cam has a longer transition area that incorporates whatever clearance specification the cam manufacturer provides- - - -usually about .006" to .008" at the intake valve stem, and about double that distance for exhausts, due to the higher temps and more stretch of the valve stem due to heat expansion. Unless, and until that test is done, there's no way to determine what the cam was originally manufactured to be. Solid lifters on a hydraulic cam are usually noisy, and they can cause damage to other valve train components.
Jerry
