This is how the official records look:
ITS 1:00.813 Leverone 2004
ITA 1:01.453 Bettencourt 2006
ITB 1:02.018 Hawthorn 2004
ITC 1:04.875 VanDenburgh 2004
Interestingly, they have this record superceeding the 'old' ITB record of 1:02.994 by Gordon Cooper in an BMW 325...well we know that to be wrong as well because Gordon drove in ITS - and there are no 325's in ITB IIRC. I do think it's Rick Pocock...just have to find the documentation. So the ITB record needs research.