Thoughts on using crank bearings that are 0.0004in too small?

1978 Ford 300

I bought standard bearings - too small. Then I bought the next size up to mix the two sets - still too small. Then I used all the bearings from the larger set, and I'm getting a clearance of 0.0019in. consistently. The manual calls for anywhere between 0.008 - 0.0015. I believe the next size up mixed with the existing bearings would get me where I need to go but I'm wondering if it is actually that necessary.