Steve, there are a few different models of Morgan, and many a Morgan has been modified by former owners, thus without more detail it is difficult to be specific. Pictures often help. Never seen a Morgan here in the UK with white wall tyres, though pretty sure I have seen an old pic of one such in the US.
Plenty of info and pics on the www, if no one comes up with an answer here, you could Google GoMoG.com where you will find answers to many Morgan questions and links to other Morgan websites.
Hope you have a great time with your new acquisition..
