I’ve got a question about the synchros between 69 down and the 70 up. They changed in 70 for a “ better” design. Is it that much better? I’ve built all years but only owned and driven 70 up style for many years. Is it worth upgrading from the 69 style on this next rebuild? Brewers has a complete assembly for pretty a reasonable price. I’m try to advice a couple of customers on the upgrade. P