bo90;
I know Lime Rock well...your MGA does sound OK and seems not to be suffering from lack of accelerator pump effect, so I wouldn't change anything without good reason...but I'd still fill Damping Oil Reservoirs with oil for purposes of lubing...
I can't help you with the broken MGA crankshaft (and I'll spare you my thoughts about it, given we are on a British Forum, and I'd like to keep my friends here...), but if I was going to race a (any!) car, I'd make it a priority to know every bolt on (at least in the engine bay and suspension!) it by its first name, and certainly all points which require lubrication...but that's just the engineer in me talking!
May I suggest you check your manuals for equally important lubrication points on the distributor, similar to the many found on the Volvo/Bosch unit:
Lube thy Steeds!