Cor crikey - hope the "Off Topic Police" are feeling sympathetic towards newbies!
Welcome LP. Have a browse around the different threads (especially the "Wanted UK Cars" one), there's a lot of reading to do. I can't help too much re the N/A engine, but there are plenty around here who can (eg Nige above), just look in their signature files.
But for general maintenance I'm happy to try to be of assistance.
Make sure you come along to Donington in March, and prepare a list of questions!
Edit: just to bring this back on topic again, although I can't compete with lending out my mats as a pattern, I'm don't mind measuring/photographing mine and posting their dimensions so that others can "reverse engineer" new ones.