header help

ok these were on ebay and i want to know if i should get them

i have a 73 duster 318 powersteering, disc brakes let me know
i know tti are the best but i dont have that much so let me know

these or flowtech or supercomps

http://cgi.ebay.com/ebaymotors/MOPA...ryZ33631QQssPageNameZWDVWQQrdZ1QQcmdZViewItem