cylinder head mods race 240z

In the early 70th as owner of a race shop I have prepared many 240z's for circuit racing in Europe
To my surprise are a few of those cars after nearly 40 years still running in
hill climbs and classic racing.
The owner of one of my former race 240z asked me details and dimensions
of the race cylinder head I have made
Unfortunately I lost all drawings and spec's of the port dia and combustion chamber.
Is there somebody who has been more careful with his tuning spec's and
willing and able to help the English gentleman race driver