Guy, welcome to the forum. You say you have joined the VHGMC, do you mean you have joined the club or just the website/forum. I ask as I am membership secretary and have not seen an application from you and just want to check it has not got lost in the system.
Regarding your enquiry, it might be better to copy it to a new topic so it will be easier to find in the future. I have information for the JAP 80 engine which I can e mail to you if you send me a personal message with your e mail address. (to send a pm click on my user id then on send private message).