Starter -
Alternator- Waterpump- electronic fuel injector-

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If you are doing a V6 swap (2.8 -> 3.4) you can take all of that off of your 2.8. When I am done with mine it will look completely stock (and the wiring will be identical) because I am swapping out the complete intake system and valve covers as well.

so basicly i just need the block then?

is it only the 3.4 that you can swap everything from the 2.8? Or can you do that on the 3.8 too? Also what is a good donor car for the 3.4?

3.8 is a diff engine, therefore you will not be able to swap components. A good donor car for the 3.4 is the 93-95 camaro. My 3.4 is from a 95 camaro with 47,000 miles. You will need the 3.4 block and i left the 3.4 heads in place, changed the intake to fiero and was able to use stock fiero fuel rail, although i used the 3.4 injectors on the rail. You will need your 2.8 distributor. I used my stock starter, obviously drilled and tapped on the opposite side. If you refer to Ed Park's website it has a detailed description of what you have to do. And of course this topic has been been to death with a stick so there a jagillion threads on it.