you can, the TBI engines dont have any crank sensor, theyre a very simple fuel injected setup that doesnt require a whole lot to run. However, there are going to be some things you need to consider when putting together a TBI 400. A few things that come to mind off the top of my head are as follows...
1. Bolting the TBI to a stock style 400 intake will not work unless you use a adapter readily available at jegs, or summit, wherever. You cant bolt a TBI intake to the 400 heads because the bolt pattern is slightly different. I have heard of people modifying a TBI manifold to fit the old style heads but I have no experience with this.
2. Youll want to obtain a cam that will be appropriate for a fuel injected motor. The cam designed for a carb motor will have a lobe seperationa angle and a duration that the TBI system will not particularly like or run at its best with. I would talk to a few cam manufacturers about what will be best with the heads and setup that you are using.
3. Figure that with the displacement of the 400, presumably the cam will be different than the stock TBI cam, youll need to to a little prom work. I got my chip from TBIchips.com. It worked ok but there is some tuning for me to be worked out still.
Thats all I can think of right now on the spot, there is more but thats the jist of what youll run into. TBI systems are very simple and are easy to hook up. Theres not alot of wires or sensors but without the right combination of parts it wont run very well. Dont expect that you wont have to do a little bit of tuning because I imagine once you get everything in there (400 sized motor, nice cam profile, etc..) you will have to play with the computer to get it to run at its best. Im sure someone will poke in here with some things that I forgot but right now I have to get back to work, after I look through some other posts real quickly.
