I've got a 1975 208 GT4 which has the same twin distributor arrangement as a 308. I suspect it's cross firing between cyls 7 and 8. My question is, how do you disconnect the HT leads from the distibutor? They don't have a plug and boot type connector as on the coils. I've tried using 'reasonable force' both pulling and twisting, but perhaps I just need to get angry with them? Or are they an integral part of the distributor cap?