Maikel
i've extracted the flanges on mine and other boats using a gear puller (like the one shown below). the bolts will likely be seated in the shaft and will need to be extracted with the application of penetrating oil and or a torch.
if you do not plan to reuse the shaft, the easiest method of extraction is a reciprocatring saw.
If anyone is going to reuse that engine they really should install a new shaft and a new flange. don't toss the old ones though, as the old shaft and flange will be needed as patterns if the unit is headed to an ariel or commander...
Good luck, demolition is one of the fun parts of the restoration process!
bill@ariel231
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