chips

i was woundering what these chips do, and how do you use them, are they worth the pritty penny, i have a 1990 stang, 5.0 right now going to be putting a 351 in, and also is it inter changbull like you can use it on the 302 and the 351. thanks.

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=380118&prmenbr=361
is this any good do you think.

differnt types of chips work differently. some u can program and r hand held and some just program ur comp. im gettin http://www.jmschip.com/shop/product_info.php?products_id=341 in a few months. but i dont think u could program it if u got a 351 swap.

that would probaly work for ur 1000 hp car but is major overkill for a 5.0.

lol, 1000hp car ok