gauge your success by your increases in poundages and muscle mass. soreness is the result of many variables, and is not a reliable indicator of the effectiveness of a program.
the running thing makes me scratch my head. it sounds like something out of some retarded muscle mag. you can gain plenty of muscle with a program that is not very cardiovascularly challenging. also, 7 minutes is hardly amazing for a mile, so even if the strong heart/ability to gain muscle connection were true, the numbers supplied wouldn't indicate a strong heart.