Without decent pictures and knowing where the bike is located, it is difficult to appraise value. Marinoni bicycles are very high end Canadian made machines and highly respected. I have owned a few and never once been disappointed.
The bike you are interested in does not strike me as a top of the line Marinoni steed. Such bikes usually would have been fitted with top components such as Campagnolo or Shimano Dura Ace. In this case, I would place the bike as a middle of the line offering. And, for what it is worth, I bought this one last summer, or two summers ago, built it up per my customer's specifications and sold it for very low four figures (CND)...
as bought for $500.00 CND and the bike was in great shape...
as sold for about double what was paid and I ended up with a bunch of spare components that proved useful on my next build...
In closing you might be interested in determining what constitutes a quality vintage road bike. If so, you might enjoy and benefit from
Vintage Bicycle Quality, an article I published some time ago.
Vintage Bicycle Value might also be helpful.