Thanks for the suggestion, that's kind of what I expected. I decided to go with a 6" Superlift Kit with Heavy Duty front springs. 4" would have cleared the 305/70R16 tires I'm putting on, but the only time this trucks going to be on the pavement for now is when it's being driven somewhere to go offroading, hunting, or cruising the sanddunes at Silver Lake, so I thought the extra couple inches of "insurance" would be wise. My brother has a '70 K5 Blazer with a '67 front clip, and 4" of lift with 33's. The rear wheelwells got munched a little after too hard of a launch off a dune.