Piston ring gap question

[Jstock85]

I am stock rebuilding a 4.8 to go in an 85 c10. Got the block back with new cam bearings and cleaned up cylinders. I got a set of standard rings which I assume are drop in. The specs say multiply .0040 time 1 inch of the borer the minimum so my question is have I figured correctly...

.0040 x 3.78 = .015

The specs do not specify any difference between the top and 2nd ring so I assume I should gap them the same?

Any information/advice/suggestions will help. Thanks!