want to get new heads.. but im on a budget any suggestions??

i am lookin to get heads for my car but im am kinda on a budget.. i was almost thinking of gettin the Gt40 heads or what ever they are off of a explorer im not even sure what years i can get those off of.. but i want to add a little more pep to my car.. so just throw me some suggestions thanks guys :shrug:
 
How much are you willing to spend will determine what would be suggested.
<$500 go for GT40 or GT40P cast iron
<$800 Thumpers or Powerheads cast iron OR FRPP GT40 Y303 aluminum
>$900 AFR or TW or Edelbrock or FRPP X303 or FRPP Z303 aluminum

Check out the sticky at the top of this forum for some info on some of these heads.
 
The GT40s came stock on 93-95 Cobra Mustangs. I am not sure but I believe they also came on 5.0L Explorers and at some point later ('97?) were switched to GT40P which is the more desirable of the two.