Hopefully one of the guys here can answer your question as to specs. We cant always buy everything we need so we do need to do some things ourselves. I make my own gaskets for the different engines I have but because I stripped them down I keep the old gaskets so I know what thickness to use to make the new ones.
Something I did for a Lister SR2 I had was to use Google to find a free download of a manual for that engine  but, I think it is only a general maintenance manual similar to what you have described. Maybe camshaft endfloat can be found using that Google bloke too.

G'Day and welcome to the Forum.
When this happens to me I go back to the beginning and double check everything. I know you have mentioned you have spark and fuel and compression may be ordinary.
I would clean the carby again checking the jets or does this have a simple fuel mixer only?
Ensure you have spark at the end of the HT lead and your new n old plug do spark when earthed out.
What colour spark do you have? Yellow to white or blue?
Timing, check it again. With your timing mark I set my points to be just opening at that stage.
Finally, this may sound odd but squirt some engine oil down the plug hole. This raises the compression which may be your issue as rings tend to stick when siting a long time. If it does start, great. Run it for a good amount of time and use a length of hardwood to put a load on the flywheel to make the engine work a bit under load. I managed to make a lot of smoke from the timber rubbing but helped one of my engines a lot.
Good luck and keep us informed.

Hi petert,
Always good to nhear tips that may help others. Obviouslyit was rust scale from th block and or head. My old CD 8hp was choked with mud. Farmers out here in Oz tend to put any liquid into radiators or hoppers and mostly from a muddy dam. I had to remove the head in my case to be able to get it all out.

come and sort my CD Lister for me if you want. After re-ringing it it has more compression than before and my bung shoulders wont let me start it up again.

Be a lovely original display at a rally one day

Ive never worked on your odel so it is a case of trial an error as to how to ghet to it. Leaking pipes is either loose fitting or dirt under the fitting or a cracked pipe. So start trying to get to them by removing what ever is in the way.

yeah sounds odd. There are guys here who can give you a positive reply but sometimess it takes time. Sorry I  cant be of any help with this problem

I would unscrew it to see whats in there but I feel it is a pressure switch.