i have a 2004 extended cab 2wd 4.8 auto 3.73 gears daily driver. i have found 2 cams im looking at buying one just not sure ls6 or tr220. will the ls6 cam make noticeable increases in power? if i use the tr220 can i use ls6 springs with it and will i need pushrods and a stall? im not really wanting to install a stall. i will be getting the ecm tuned by nelson and installing my long tubes and air intake when i do the cam. any info will be greatly appreciated.