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hope this helps, used it on a 411 swap on a 97 l29 454 with a 4l80e

Dont know if you allready got it, here's 2 stock tunes

Hey did you ever get this figured out im trying to do the same for a pto

This tune still needs work but it runs well and gets about 15 highway.
97 2500hd Long tube headers, 3in duals with H pipe LS6 injectors, 35s

Dont know if u found any tunes to compare, but here's the one ive been running for the last 6 or 7 months. A guy Jeff tuned the ecm when i bought everything to do the 411 swap from him,on my 97k2500....