You can edit that. Well, what vehicle are you contemplating doing that with? 6 cylinder? Relatively easy. Think about it, one object at a time. Less daunting that way. And I'm taking for granted that you have the donor vehicle handle, will certainly make the swap easier.
1. Engine Mounting. If yours is a V-6 it should bolt in. The engine mounts and the trans should bolt right up. Done
2. Exhaust. Probly won't match right off the bat. A simple combo of the two should get you to a muffler shop til you can do it right. A couple of feet off the 3.5 exhaust from the collector, cut a couple feet off your 3.0 exhaust, some flex pipe from any part store. Done.
3. Fuel. Here is where it gets interesting. Will the stock 3.0 work? Not researched that enough. Flow RAtes, Pressure, etc. If not, then figure out way to put a 3.5 one where the 3.0 one is. Then figure out how you will mate the 3.5 fuel to the 3.0 body fuel lines. Done.
4. Electrics. This is what kills it for most. Ususally over thought out though. ECU remove 3.0, put in 3.5. Wiring Harness. Seperate and remove 3.0 wiring harness. Label everything. Gauges wiring, battery hots, ignition hots, grounds. If you can have both side by side outside the engine compartment, this would go much easier. Have the 3.5 with it's harness still on, remove the 3.0 with it's harness complete. Then compare connections, figure out which are body connections and which are ECU connections. You can figure all that out while it is still outside the vehicle.
5. Accesories - air intake, power steering, AC. For starters, with an empty engine compartment, You should be able to mount that stuff in the original placement on the donor vehicle. Maybe have to drill some holes, etc. Done.


Not minimizing the swap as just an engine change, but it is much easier to contemplate. Leta ll that roll around a bit. One step at a time. And I'm sure others will come in and want to shoot this down. Instead, please feel free to add to it. If this Hyundai 3.5 deal works, this can open up an engine swap choice for the older models. Now if you have a 4 cyl, an addendum to the motor mounts is cutting off the 4 cyl mounts and moving them to allow the proper placement. And down the road; extra weights on torsion bars, weaker 4cyl axles.