the "truck" heads are the vortech heads everyone is talking about. Yes they do flow better than the old humps, bigger runners etc.They have a diffrent intake bolt pattern than the older heads.
yes you can get them for about 400-500 a pair, intake, anywhere from 150 and up depending on what you want.
My self i dont like the vortechs,thin casting and like soemo ne else said in here wait another year and see what everyone thinks of them.
other things to consider, centerbolt valve covers, special allinment rockers pretty pricey for anyhting but stock ones,
by the time you get sone witht he swap, your looking at around 700-1000 bucks, myself, i`d look in to aftermarket heads just my opion