Thankyou all for your input. I have decided to go down the path of fabricating a new sump and riser. I think recasting would be very expensive and I feel quite confident in making the parts myself which I will do while the professional people do the head, block etc etc. On a good note however, I removed the oil pump from the crank case and pulled it apart. It is in great condition so I just cleaned the gears and blasted the housing and it will work like a new one which is not bad for 80 or so years old. The sump is 100% not useable as you can see and what you can't see is just as bad. At least I know what I have to do.
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