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well i wouldnt put that much nos on that motor maybe like a 75 shot 125 is way to much for that many miles in my opinion
you must not really know s**t about the 5.0 shortblock. as long as everything checks out you can get a lot of use out of it. 125 isnt going to hurt it. most kits say 125 but are actually lower in the shot. he's looking at around 100 wiht those kits with a 125 shot.
if hte motor shows any wear dont go high if you want it to last long. any motor can hold up to 'NITROUS'if properly setup and not abused.