midget,Sorry, very busy.
Regarding crank sizes:
Mains, Std size for 1400 Rover, crank should be ground @ middle of spec to low limit, Mahle Motorsport (Vandervell) bearings
Rods, Std size for small journal BMC, crank should be ground to middle of spec, Mahle Motorsport (Vandervell) bearings
Normally, for service parts, the crank size spec is a range of .0005"/.0006" from high to low limits, as opposed to the factory build sizes, which are "graded" in 2 or 3 steps. The "grading" process recovers parts that are "slightly out" the main sizing spec, thereby lowering manufacturer costs. In a perfect world, all parts outside of "spec" would be "discarded" as "not useable". However this does not account for Mondays, Fridays, or 4 beers/ 3 martinis, with lunch.
I think the sizes are readily available in both metric and inch sizes off the King Engine Bearing online catalog.
Vic,
Considering a B'ville trip this year, even though the Midget is not very far along. Let me know when you are going. Any chance you will attend R/A in July?
Fordboy