I am trying to use sealed power v1558 valves in my A engine but I only have 5 on hand, I tried to use the sealed power number to buy some more but the warehouses and parts places want an engine vehicle application , they can't or won't cross the numbers over to their brand of parts, The guide application is for a 61-63 olds or pontiac 315 cu. in . engine . I cant find what engine manufacture /application the valves are supposed to fit, luckily I have plenty of valve guides on hand and 5 of the v-1558 valves already or I would just buy the kits available from the model A suppliers. appreciate you help . Fordestes .