with as hot as it gets at glamis around this time i would say 155mains....i have the same carbs and run at a 162main and its too rich...as for pipes i would go with shearer or cpi's they will go with those mods very well
to tell when the reeds are wearing out is if there breaking or have chips. my v forces are just as old as yours and run like a champ. so you should be fine for now