I am in the planning stage with my 92 Roadmaster wagon with a stock 5.7 and TBI. I would like a nice family cruiser and tow rig.  After reading the article "EFI for the Caveman," I was wondering... Would changing the TBI over to a Powerjection I, or an Edelbrock system or a Holley be better?  Would it increase my MPG and power? Would the cost be worth it? Someone should do an article about EFI upgrades, i.e. computers, injectors and/or systems.