I’ve been offered a 6.5 swapped 88k 2500 for a cheap price, should I buy it?

[skylark]

You know what, I don't think you've had enough struggle yet, I think you need a 6.2 as well

At least those were somewhat reliable. No electronics, no turbo to create heat and increase exhaust pressure, not enough power to break a sweat in Vegas. So slow a turtle is bored but it would likely get you there.