DOES ANYONE KNOW ABOUT REBUILDING ROCHESTER CARBIES , IS IT BETTER TO BUY ONE OF THE LATER REBUILD KITS OR AN ORIGINAL 70'S PERIOD KIT .AS I HEARD THE THE OLDER FUEL PUMPS DONT SEEM TO LIKE THE UNLEADED TYPE FUEL & THE DIAPHRAM DOSENT LAST TO LONG IS THIS THE SAME CASE WITH THE CARB KITS OR IS THIS JUST AN OLD WIFES TAIL.WOULD THE ORIGINAL FACTORY KIT BE A MUCH BETTER PRODUCT AS FITTING WISE AS I TEND TO THINK GENUINE PARTS FIT LIKE A GLOVE.BUT AS FAR AS THE FUEL SIDE I THINGS THIS MAYBE THE CASE ???