I'm starting to lean towards the L76/L92 valve springs Pure mentioned yesterday and others have mentioned before. They have the same, if not more seat pressure, but the spring rate isn't as high as the LS6's. This would be ideal for a stock timing chain as the spring rate on the LS6's is higher than #130 springs. I know a lot of people who use LS6's on stock timing chains and haven't had a problem, but it doesn't look like it would hurt anything going to a more dampener friendly spring.