Welcome George. You can get all the parts from a vendor like LMC. There are others too though. Check out this link of my website to see some of these vendors.
http://www.shelbournes.net/trucksite/links.htm
As far as the gas mileage problem, you may want to post that in the 73-87 Message Board forum for more response. The 700r4 will help with the gas mileage if you drive alot of highway miles. However, it could also be a carb issue. I wish I could get 12 mpg!
