here is one for you. the return spring holder on the 283 would have been on the the oil filler road breather in from of the engine. we are not using that set up as this engine is a pvc and oil cap on the valve cover. neither did the teh 350 and high rise intake. so were to hang the return spring. the 64 carter has the spring in front. amount the new parts in the back of the car and there were a lot was this tab. the business card was in the sack. interesting to note that there is no website listed on the card.