Jas
I was unfortunate enough to own the first 349. It had a full 349 motor (the 348's were actually 306's). It also had an integral bashplate and had done away with the rear frame mudguard loop. Mont didn't o their homework regarding doing away with the frame tubes that ran under the motor and this transferred the stress to the headstock causing it to fracture with monotonous regularity. The first 349 had, in the words of a trialscentral poster, the turning circle of a supertanker. Later 349s (see below) were an improvement on the first 349 but, in the case of the last 349, it was completely eclipsed by the fantics.
Price, in good condition probably around 2,500 to 3,500. Mint condition: about 4,000. Barn find: probably 600 to 1,000.
I wouldn't discourage you from buying the first 349 nowadays but for intermediate to expert level riding of the early '80's (which is what I was riding) the damn thing was a liability. For clubby twinshock events it will be ok.
PS. be warned about the tank. It was an early attempt at painting polypropylene tanks and the paint flaked off. Modern prep techniques are much better and the paint should stay stuck. Also: the tank had a level gauge. Finding the grommets is difficult.