Both would be fine.  When the V6 was first introduced the batteries probably weren't as well manufactured as they are now, so even if its slightly lower rating you'll probably find its got ample juice anyway.

If it concerns you, and you want a really beefy battery, you could look into a Deka marine battery with Absorbed Glass Mat (AGM), or similar.  I have one in the back of my 2.0 litre, it is the same size as the 440 CCA one that was in it, but puts out 785 CCA.  I'm waiting for my starter motor to melt, it spins that fast!  However, they are quite expensive compared to your run of the mill battery - I got it because it is fully sealed, and won't splash battery acid everywhere like my previous ones, was cheaper than an Optima gel cel or similar, and I used a mates contact at Batteryworld which meant it worked out pretty cheap.

thanks for the tips guys.

I will put it in and see how it goes.

catc ya

Shane