[I4 to V6 Swap]

I already did it. It clears fine, and I don't see any problem with the oil lines. A gen 3 with a gen 4 1mz and a blower actually has a little more room between the engine and firewall than the solara or gen 4. Don't forget the computer.

 

[I4 to V6 Swap]

That's correct. I have the 5pd too. Rigging the computer to work with the gen 3 is a bitch. If you aren't going to do the wiring yourself, California rewire in rancho did mine. They did a great job.