thanx to everybody that give a brilliant opininion and supportive comment

...well i guess...im gonna stick with replacement of con-rod for every1-2 gallon...im an on-road racer...and i always run my engine a little rich...i dont like to tune my engine to the max limit...just nice to get the power then i will be concerntrating on other parts such as clutch system, pinion and spur gear to get race performance...
plus at my LHS i can get him to replace my con-rod and the pin at the sam time

...it's better isn't it?

.......thanx guys...