I've also driven Vader and Jan is right: while it's got some poke, it's not a Tiger.
That said, in my outspoken opinion, if I were going to build a V6, I wouldn't choose the 2.8 for the following reasons. First, it has Siamesed ports, so it's less efficient as a breathing machine than its same-physical-size 2.9 engine, which doesn't have the same Siamese disease.
But there's another option. There's a 4 L version that fits in pretty much the same space and it would make the Alpine MUCH more like a Tiger than either the 2.8 or 2.9 --for acceleration. After all, there's no mutability to the statement that "there's no substitute for cubic inches".
I've driven another V6 that's very well turned out and it's Much of what a Tiger is, up to a certain point, and it handles better. So it may come down to a choice of brute power ( Tiger ) with a little of a handling challenge ( that CAN be managed: Doane Spencer did it to the point that his Tiger could beat a Cobra, if Dave MacDonald drove it ). But if *I* were building a V6 Alpine, I would do everything in my power to source a 4 L V6 and take that puppy to town, with the thought that the straight line would come Very close to a Tiger while the handling would remain more supple. I, for one, am not convinced that the V6 option has been fully developed. I still think it is the car Rootes Should have built...
Cheers
David