Ok so it's either a 5.3 or 6.0 if it's LS based in a van, the only 5.7s in vans were a SBC and stopped after 2002/2003ish (in the US/Canada, other markets like Mexico had the SBC for a few more years).

I looked at the log, it ends right as the van gets near normal operating temp. The idle spark is jumping around a decent amount and STFTs are negative, but both STFTs and O2 mV swings look semi normal.

How did it die originally? Has a compression and/or leakdown test been done? Wondering if there's physical damage.