Flex head ratchet is what I use on my 3800 II PA.
Also reccomend OE plugs and wires, I use AC Delco, best plugs to go with IMO are the iridium plugs.
Rockauto has a rebate going on for the Iridium plugs at the moment.
ACDELCO Part # 41101
Here is a link to info on the rebate, and the link for the rebate form, scroll down a little to find ACDelco Spark Plug Rebate info.
RockAuto Current Promotions and Manufacturer Rebates
Spark Plug Wire Kit is ACDELCO Part # 746EE