360 vs 383

So, does anyone or has anyone put a #1,2, or 4 main bearing in the back journal of a small block? Maybe 1/4” narrower, needed to grind a new bearing tang groove in the cap and block. Narrower bearing for less drag . This was right in the dc bible, right by the old flip the pistons backwards page. Guess this would be with the same thought as a 340 bearing spacer in a 360 that Bill Richardson sold.