3.1L and 3.8L interchangeability?

[Smokin2000gtp]

So I've got a '00 Buick Century Custom 3.1L right now unfortunately lol. Long story short my '00 GTP and my '05 Subaru Legacy GT Limited Turbo are no longer living. I've got a ton of aftermarket parts (and even the car still that I'm parting out). So my question is, are there any parts off my '00 GTP that I could use on my '00 Century?

I've still got a bunch of coil packs from my GTP that look like they might work. I've also got some old ceramic coated S&S headers which seem like they may fit also. How about modified stock 1.9 ratio rockers? Is there anyway to use my DHP powertuner with it? This might all be a shot it the dark, but hey I thought I'd try. Oh and I've got some brand new ZZP plug wires and an S&B filter that will work for sure lol.

Anyone got any advice?

 

[Smokin2000gtp]

I've also got a ZZP Water Pump Underdrive Pulley that I can take off if I can use it.

 

[dsmuts]

Rockers no headers no dhp yes

 

[camopaint0707]

What makes them not living?

 

[Smokin2000gtp]

I'm loving the fact that I can still use my DHP! Lol.

But as for the demise of my GTP, it ended up either spinning a bearing or throwing a rod at 194,000mi due to lack of oil (my own fault). I hit a deer with it several weeks before and along with more damage from losing a wheel I lost all hope in my baby so now it's a parts car. My Subi on the other hand was the result of snowfall, night time, alcohol, and one very bad wrong turn coming back from a North Dakota bar...I ended up flying off a T intersection and bending the frame and killing the engine (stupid interference engines).