I have a 91 formula 350 tbi (was originally a 305, someone swapped the block and maybe the heads not sure their) and it is stock except a catback exhaust. I have already purchased some headers for it and getting ready to buy the y pipe and hollow out the cat. I will also be purchasing a tb spacer and injector spacer as well. And as soon as i get the airfilter situation figured out i will be either buying an open element or a k&N ram air (if i can make it work.) I just wonder what kind of E/T you think it will run or the horse power it will make with those few mods. Also do you know of anything else that will help out that is cheap without breaking into the anything to deep. Thanks