I was looking through the internet for Buchanan stufff and found this web page. I also own a Buchanan with a MG Y type chassis and MGA engine.
Buchanans where put on many chassis with different engine confiurations.
There is a very good web page on Buchanan's at
www.v8vantage.com
Just click on the Buchanan logo to enter.
If you would like to catch up for a chat on any thing Buchanan drop me a reply.
Regards Alan