Go to
www.broncograveyard.com and check out the bush wacker fender flares. You want the cut-out flares . . . they look great and hold up nicely. A buddy of mine has a set and they'll take a lot of abuse. I believe they'll runn you $100-120 per set so figure on at least $250 to do your truck. I have not found fender flares for 73-79 trucks anywhere else at a better price.
Ivan