Welcome Earl,
What type of MGA--roadster, coupe, 1500, 1600, Mk II, Deluxe, Twin Cam? If either of the latter two, E-mail me off-line and I will gladly take it off your hands!
Another good source of original equipment info are the free Moss Motors or Victoria British catalogs. Thesse two companies carry British Heritage-approved parts and show the parts in exploded, isometric views by system--engine, fuel, electrical, cooling, etc. The catalogs will also explain the codes included in the VIN and chassis ID numbers--engine codes, paint codes, etc.
Finally, a local MG club can be a great source of information, advice, and parts, especially if you need hands-on assistance (unless you live near Huntsville, Alabama, then you just go see Tony).
Happy motoring,
Steve