Dave,
I run a 1999 classic +8 , and can give you a few pointers.
The post 1998 long door cars have the stainless steel valences and bulkhead and are well worth seeking out.
The injection system changed from "Hotwire" (simpler with only fuelling ecu controlled) to GEMS (more complex with both fuel and ingestion fed from ecu) in about 2001/2002. Many prefer the simpler Hotwire option, as you do need less knowledge of electronics to cope with it.
The suspension will certainly be less forgiving than a TVR , but can be improved with the Suplex front end mods (say about £1000 fitted or £650 diy) and if you really need it , the Suplex 5L rear suspension (say £2500 diy or 3500 fitted) , but before committing to any such mods I would just drive drive a standard set up for a few months and see how you get along with it. Part of the charm of the Morgan is its (relatively) poor road grip (especially with V8 power available), but the excellent handing compensates.
Most of the other things can be detailed to your own spec later , but choose the colour and the interior colour carefully, one combination will probably chose you. Stick to only 2 colours. Making the choice between wires and alloys is the other big decision. Alloys are lower maintenance, lighter unsprung weight, but some prefer the wire wheel looks above these disadvantages.
