I spoke the folks at Moser and they were very pricey on a complete assembly, about $5200 shipped. I am only building for Sportsman class drag racing. I have a 318 .30 over, KB pistons, and a large cam with 360 heads that may develop up to 400 hp at the shaft, so I would think even a 741 case would hold-up fine, I would just prefer a 742, or 489 to 'future proof.' If it weren't for budget I would go with Moser or Strange (they are cheaper, around $3400-$3600 delivered).