Other items I forgot to mention before that will also need to be changed are the y-pipe, oil filter right angle adapter, & breather tube.
As far as the computer control goes, you can keep it to control the 400 if you want. That way you can re-use your existing carburetor, distributor, and wiring harnesses. You will have to add a fitting for the O2 sensor to the y-pipe or exhaust manifold. Others on this board will probably argue that you should scrap the computer control, but I like the idea. Computer control will help economy & emissions for normal cruising, and under heavy throttle the control is bypassed giving you full performance.
If you do not have a donor car, the expense of finding all those parts individually will add up. You may want to consider just rebuilding the 301. In stock form the 155 HP 301 from '81 is not that much lower powered than the 180 HP 400 from '77-'78 and weighs a lot less. The 301 is somewhat over-maligned in my opinion. But if you want to rebuild the engine for a lot more power than stock, the 400 is the way to go.
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