Actually the original motor would have been a straight 6 not a V6, but that aside......

There are variables to be taken into account when figuring out the "perfect" front springs. Ideally the correct spring will leave the lower control arm parallel to the ground when everything has been bolted up.

Besides the basic engine weight any additions or subtractions to front end weight should be looked at. Things like an aluminium intake vs the stock cast iron intake can shave as much as 40 pounds off engine weight, aluminium heads can be worth 50 pounds, even a few pounds can be shaved by going with an AFB vs a Holley, smaller battery, alternator vs a cast iron generator etc can all add up. A transmission swap will also affect front end weight.

Without knowing a bit more about your specific setup, the V8 springs are probably the correct choice for your project. If it does set a little high, live with it for a while as it's not uncommon for a new set of front springs to settle an inch or so over the first year of use. If the nose does sit a little high that can always be compensated for somewhat by going with a shorter tire.

As far as the tire leaning (camber) anytime major front suspension parts are changed the car should be realigned, and there should be enough adjustment in the suspension to compensate for camber/caster changes.