Have a machine shop inspect the journals, usually if you can feel a scratch or a groove with your finger nail the crank needs to be ground undersize .010”. If the journals are nice and groove free the standard size bearing would be appropriate.
Really! wise up people, think 'less is more'. Cranks deserve more thought and patience. The less you grind a crank the more you extend it's lifespan. It's not 1976 or 2016 for that matter where you can stumble across a NOS crank in a shipping container full of factory spares! I'm sure there maybe a few machine shops that have idle capacity in machines and people waiting to cut your precious crank down by .010' if they say so!
If you can't tell me which bearings are different on a 2L crank how are you first going to tell the machinist, and second how will you check they did what they are suppose to do?
So here is my strategy I use to avoid unnecessary grinding of my cranks
1. Measure the crank a few times
2. Work out if the crank journals are in the range for blue or red std(You have)
3. Look at the surfaces of the crank, if fine ,just nitrate it again and micro polish it to come back to specs for the bearings you will use.
4. Look at the surfaces of the old bearings
5. Get some bearings NOS blue and red or reproduction, buy all three sets(cheap really in relative terms) if you factor in the cost of the engine build i.e. parts and labour and longevity you are chasing for your engine (i.e. to last another 50 years, because you want to of course!): you can on sell the other bearings not used.
6. Fit the bearings for the correct clearances for the application you will use the engine for. If the reproduction set is too loose, work out if you need the blue or red NOS ones and get them fitted.
7. Don't forget not all the bearings are the same along the crank!
In Australia there are new laws so as to protect consumers, even if you as the consumer supplied some of the parts like bearings to the engine builder.
If you do choose to have your crank ground and later find one of the bearings has seized or your crank has snapped and destroyed your engine well?