The “Twelve Port News” Sept./Oct. 2003 issue discusses use of the Cadillac L61 6 liter 368” V8 3.800” piston.
The 3/16" stroke change only increases the displacement by 4.8% (261" becomes 273", etc.). All of the remaining increase is due to large piston oversizes.
The 300" engine mentioned in the article requires a 3.93" bore, or .179" (almost 3/16") over 261" bore. With that bore size, a 261" would be 286" with standard stroke.
