2006 Chevrolet Impala

2006 Chevy impala 3500 v6 Bought it I had it towed home when I try to start it it just cranked over then replaced the battery with the right one went through the fuse box inside and under the hood replaced some fuses and then I just put the key in the ignition and turned it over and it fired up. I put two adapter and flex pipe on to quiet it down but it just a little loud cause some one try to cut the cats off but did not accomplish it so there two cuts where they try to Only thing I know is wrong with it is a lifter started to work on it and some other things came up and lost interest in it needs a new spark plug wire and new valve cover gaskets and a new line that runs from the heater core to the thermostat housing Asking 800.00 for it . Will need to be towed our car dolly if possible trade for a truck s-10 just let know what you think clean title in hand