For starters, you'll need a 25-06 barrel and a barrel nut wrench; an action wrench or a bench vise with hardwood blocks will be very helpful in breaking the nut loose.

You'll need a long action .473 bolt head for the 25-06 and I'd HAPPILY buy your long action .223 bolt head if you want to get rid of it to help finance the swap.

You'll also need a 30-06 staggerfeed mag well & mag follower, if you want to use the magazine.