Subject: Re: Anybody knows this 3l Saloon?
ask Aston Service Dorset for the built sheet of the car. This gives you the complete specifications when the car left the factory and a few years of service records (costs 30 GBP and goes to charity if I remember right)
http://www.astonservicedorset.com/services.html
by the way: your engine number must read LB6H...
do you have an image of the car, you might post it, always nice to see them