The block is a 61 390hp casting, solid lifters, oil press relief....nice block and very rare. Some of those blocks have VERY thick cyl walls. The heads are not original and std lowriser heads. Thr 390 hipo used the COAE-D heads with the small peanut shaped chambers like the new Blue Thunder "Glidden" style chamber. Intake sounds like the original. They had no casting numbers...just the firing order and sometimes a date code by the thermostat housing.