i agree go ls1, with an fbody its diff than a truck and the weight reduction will also help with the aluminum block. overall id say trade the car. u think ur saving $ but ur not once u start getting every little thing needed trust me it was the same way on my v6 to v8 swap. looking back i prob could have gotten a 4.8 and done the swap for cheaper than i did the 4.3 to 6.0 swap. i dont regret it completely but looking back patience was important. everything on my truck is bargained!