Going by your bore dimensions it's the post 1939 24 stud '100hp' that's the 239CI 3.9Litre also known as the 'Merc'. According to the parts books Ford US and possibly Canada manufactured the 24 stud as an 85Bhp (3.6Litre) and also as the 100Bhp (3.9Litre), the 3.9 being introduced in 1939 for the Mercury car range hence the 'Merc' tag. From what I gather there was a tweek on the CR at some point which had the names changed from 85Bhp to 90Bhp and the 95Bhp to 100Bhp. That was for US, I'm not sure what happened in the UK or Canada. I've got a nice period engineering journal report on the 'all new' 24 stud of 1939 which I picked up in the US, I'll get is scanned in and posted.
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Alastair
Lincoln, UK.
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