Question for GT6 experts. I think have a MK1 with an engine block number KC460L. Is this a MK1 block. The head, however, is obviously a later MK2 or 3 head and is using a head gasket set that says "GT6 MK3 head gasket set recessed". Other clues might be the main bearings which are VP91253 and rod bearings VP91252. It does have cam bearings. thxx, Bob