I know that there are companies that make aftermarket exhaust kits from the headers (collectors) on back, (TTI, dynomax, flowmaster etc.) And from what I am reading TTI is the best. The question is this - Can the same kit (from the collector back), be used on a small block (340) and on a big block (383). In other words, is the width the same for a BB & SB where the collectors are (both using headers) ??