I would think a regular spark plug socket should be fine. As for how long an extension you'll need, that's probably a question best left to the HEMI guys as is how long it should take. If it's something you're familiar with, keeping in mind the plugs in back are a pain to get to, probably 1-2 hours and if it's not something you've done before, maybe longer would be my best guess time wise but good luck!
Hi i'm about to change my sparkplugs on my truck here soon and just wondering do i need a special size socket to fit down the value cover to get at the plugs and about how long of a job this will be so i can leave myself lots of time to do it? Thanks