it would be advised....I mean, it's your truck now...I would hope that you knew everything about it ensuring that it was done right for peice of mind as a blown motor aint cheap...
Find out all the mods....and everythign about the tune..
who and how the tune was done...a/f, timing etc?
Does it have an aftermarket Valve Body in the Tranny and if it has a tune was the line pressure increased in the tune ?
pulley sizes?
MAF Extender?
What kinda of plugs, when were they last changed and what was the gap set to?
etc etc etc
just my .02