When you put L67 injectors on the L36:
Did they use the same o-ring seals?
Did they use the same clips top attach to the fuel rail?
Did you swap them because you needed more fueling...if so, how did you re-program, and how much fueling did you go to?
Was your stock L36 fuel pump able to handle it?

Thanks

Depends on the year of L36. L67 injectors have been the same through all years and are a standard bosch type injectors. If you have an old L36, it'* a direct fit. Once you go to newer years, the length of injector and the electical connector change.

In my years, I have not seen a person build a 3.8 liter L36 that mandated needing larger injectors. The PCM does not report IPW accurately and the car will continue to get richer til around 25ms pulse widths. If you did want to install larger units and reprogram the PCM, it wouldn't cause any issues though.

Some o rings and clips.
I didn't really know much about tuning when I swapped the injectors. I knew others were runnign them without issue and people with similar setups were beginning to max out their pulse widths. I was using an AFC 2.0 at first to scale them back at first (about 86% IIRC) but then I had chips burnt for my OBD 1.5 pcm to get the afc closer to 0%.
The fuel pump had no trouble keeping up.

I gotta go by what the PCM and PowrTuner are telling me...and if L67 FI'* are a cheap and easy to obtain direct swap in, sounds like I can't lose.

By "old" L36 I assume you mean 99 and earlier...I did notice that the '04 LeSabre L36 injector harnesses (and injectors) are different from the '98 (the '98 is the car I'm interested in swapping injectors into)

Is that "some" or "same"?

Whoops, I ment same.