Gliders.

Who wants a 2010 Or newer engine......

 

Careful reading of the final rule above says that "ONE of the following conditions must be met" as to the engine. Not all. This is important, as it is the critical part about a legal import. So an older engine, like one prior to 2010 model year, would still be allowed, as long it has not reached the end of its useful life, even with a rebuild. But a person considering going down this route probably should at least check with a lawyer familar with import laws before putting down a deposit to order. And the provinces still have the final say on actual registration, so there is that to consider. The safest way to go is to find an older, solid, pre-emissions truck and restore it to like new condition, like gearheads have been doing with classic cars for years...

 

I won't try to sway you, if it were me, I would think long and hard about which way to go, new, low mileage used, rebuild desirable older truck, or build a glider.
Aside from a new truck, the other three ways can cost you dearly as well if you do it right, or if you don't do it right,which is rebuild the truck from the front to the back and don't try to save a few bucks by mixing new and used parts.
My advice, just do it all at once to save yourself from future worries and stress, make it a new rebuilt truck, start with a fresh slate.
Having said that, the local Pete dealer had a bunch of gliders last year that they built, all 6NZ Cats, and the last one was sold recently, within the last month or two.
I would contact your local Pete dealer for answers.

It's story time, kids!
An old friend of mine who hauls livestock built a 389 glider about a year and a half ago, his tenth truck in 40 some years, a tough decision he told me, even on paper the glider cost as much or more than a new truck, but he went with the glider to get what he wanted, simplicity, economy, good power, longevity, durability, reliability and his engine of choice, even though the gliders gonna cost more than a new truck.
He chose to go with a 14 liter Series 60, his first one ever, but he owned a couple 8V92TA's and really liked them.
The engine was built by a serious engine builder with the best parts available, factory or aftermarket, high flow exhaust manifold, turbo, pistons, yada yadda, everything precision balanced, improved air flow in the cylinder heads, every little trick known to man, everything was new except for the block, head, and maybe the crank, the engine was better than new when it was done.
I think he said the engine cost him around $45k, which worried him because his warranty was limited when compared to new engine from the factory, but the engine builder assured him this engine could make an easy 700 hp all day long and there was zero chance of a meltdown, so they set it at 575 hp to make sure, at least until my old friend made some money and gained trust in it, which is something most of us do, get to know and trust the truck, better than you know your wife or girlfriend.
To date, he's pretty happy with the truck, he pulls a tri axle livestock trailer at 105,000 lbs and his fuel mileage average to date when I spoke to him last was 7.2 mpg, but can't remember if that's CDN or US, he runs both sides of the border, still not bad for a new engine through it's first winter.

Edit:
Might have been $54k for the engine, memory is getting fuzzy.