Just thought that I'd have a look at the summary from Log book #1 and found that I last flew a C210 on 27/8/84.
IIRC it was VH-TEV which had gear doors, and I was told by the Instructor who checked me out on it (Chris B) that it was then reputedly the fastest C210 in Australia!
From memory we were at 3,500' in smooth air and I was told to set 25"/2500rpm in level flight.
I think we achieved 175KIAS. A bit too long ago to say definitely.