Today, I bought the set of shorty headers that Lance (428kidd) had for sale in the classifieds. I was going to see if they would fit the 68 fullsize Merc. With Marx427's posting it looks like they won't fit. Luckily, the shorties will fit on my 64 Marauder.
Looking at the Mercs, I think the 67 and 68 are similar. 69 seems to be the next year for change. I bet the C5 long headers will fit------well, I hope they fit. If the 68 Colony Park gets a stroker, I would definitely like some cast iron headers. I want the performance without creating excess noise. Quiet and fast is nice.
If someone were to cast the C5 long headers I would buy two sets.
thanks,
Mark