I think I may have blown a power valve when I first fired the engine up and it backfired through the carbs. Having issues on low and mid range acceleration when I put my foot in it. As near as I can figure out the partts book calls for a 32 power valve which they call a power jet. Will the power valves from a later flat bowel Holley fit and work? Is there a source for individual power valves? Suggestions on what # valve to use other than the 32?