You made a very good buy lots of work went into this. First let me say that you need not worry about changing the stock bearings and oil delivery system on a BSA as it comes. With just an oil filter added to the return line they will do many miles. The A-65 motor needs to rev to produce good power much more than a Norton. You do not want to lug this motor. Learn to love RPM's nearing 5000 at a study pace it has the rod ratio to take that and the stock cam is hot you will feel it kick in. With a duel carb bike mileage will not be your strong suit. But third gear will have you doing the ton beating on even modern bikes. Make sure the carbs are well sorted spend you time and money there first. Oil filter second. These days with our gas an E.I. and leaned jets are a must. Clean up the wiring people who do these customs often fail here.
I can't see you effectively winning races on a bike built like this and a bearing conversion should not be necessary, they cost a lot because they are a lot of work as you will see. Get the bike running well and hold it at 7000 RPM if you fall in love with the feeling proceed with money gun a your wast. These pictures were taken just a week ago at Ed V's shop of his very well thought out bearing conversion. Main case modified :
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Oil pathway modified:
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A pocket added to the inter side cover:
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A quill added to the crank:
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A two piece sleeve to run in the new bearing:
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