Please get your inspection report in writing from someone who knows these cars. I won't hold myself up as an authority here but folks have been making weslake valve covers for windsor heads for a fair while now. I'll try to attach an image of a SBF with Weslake heads
IMO, this GT40 has weslake covers on windsor heads and that is not a ZF box behind that motor (probably a Getrag t-ax). Neither of these things are necessarily worrisome (other than you seemingly were told differently) but you need/deserve to know exactly what it is you're paying for.
Good luck!!
