HG, I also ran a dry cell alarm battery, until I found a battery that was one pound [ 6 pounds less] and in JF we are always looking to save weight, 3.5 lbs/ci including driver on alky.
If you throw a part in the air and it falls down, figure how to make it lighter, it all adds up, if you can take 100lbs off your car/ and or driver , you will pick-up a tenth.
And rotating weight is even a more advantage, ie 1 lb of rotating is = to 9-10 lbs of static weight. An example if you go with front/wheel combo that weighs 8 lbs each and take off 18lb, ea wheels/tires, it's like you just took off 200 lbs off your combo.
It's also about total car balance.
Jon