[Scarebird]

Engine swap Supply has these, but not in shorty form for "A"s as far as I can tell.

I have not seen a big enough difference in tests online to warrant the trouble of headers.

Note that LS headers will not work - the exhaust and intake ports swapped positions, one of the big differences between LT and LS motors.

Other issues are oil pans, motor mounts, intakes... it goes on and on.