I have a 73 MGB, new owner, just bought it in in May. I have a problem--I want to adjust the timing so I'm fiddling with the distributor, but I can't get it to budge. I've loosened the clamp plate bolt, even taken out the 2 bolts that hold the plate to the engine. I've dumped probably half a can of PB blaster on it over several days, tapped it with a hammer etc etc. Can't make it budge at all, in any direction. Anybody got any ideas?