The pin going through the oil ring is a non issue. There is a steel support ring that goes on before the oil ring. The piston does not drop further out the bottom of the block, so again a non issue. A general observation is that a "stroker" engine will consume a small amount more oil than a stock engine. I will contribute this to the fact that if built correctly for high performance use they will have slightly looser clearances than an OEM engine, especially if they have forged pistons. A lot also depends on the quality of the cylinder finish and piston rings. I know Ralph Button runs 347s in his Roadster and has accumulated over 600,000 miles.