2002 GMC sierra. currently has a 5.3 liter with high mileage. i want to replace this engine with either a 6.2 liter v8 or an 8.1 liter v8. preferably the 6.2 tho. what would i need to do to do this? and what would the cost look like if i got it done by a proffesional? what other parts would i need to replace? thanks
