welcome to the Club,
The zed does offer a good solid platform to start with if you are looking for a project car. the V6 is very smooth and the power delivery can be deceptive (can feel slower than its actually going)
but like any car it has its faux pas, Weight is an issue at about 1.6 tons its not light, if you track your cars this will mean that she eats pads and discs quicker. but the weight can be combatted either with more power, or a diet. but the down side of the diet, does mean increased cabin noise.
as for the power increase available the zed leaves it self to huge positives and negatives at the same time. Because its a good solid V6 it means that you can bump up from the stock 276 bhp to over 350 bhp without having to use a forged engine. i believe the engine is good for 400 bhp before you need a forged setup. but the down side of the engine is its not easy to tune if you keep it to NA people will spend £1000's to gain only 20-30 bhp where on other cars spending that money can see big gains. its very easy to strap an FI setup on it but as has been said you need to pay big money for it.
what ever your plans are i wish you the best of luck, my usual advice is that if you want to work on something to gain better numbers then by something that came as FI from stock, but if you like the Zed's shape, engine etc and are happy to spend the cash needed to turn it in to what you want; then enjoy the process and i look forward to seein gyour build thread as it progresses.