I hope you are right, I would be pleasantly surprised if it was that easy, you make it sound like you just need to hook up a 12V wire for the HEI and you are good to go. I imagine a lot of work sorting out what you need and what you don't with the factory computer, but if they have already done all that work for you for a reasonable price, that would be easier than a normal DI swap.
This the place i'm referring to:
Current Lead Times: 6 months This Swap Ready Turnkey pallet features a Chevrolet engine out of a 2014+ Chevy/GMC truck with less than 100,000 miles. It is a LV3 4.3L rated at 285 horsepower and 305 ft-lbs of torque from the factory. The VIN from your donor vehicle will be provided. Please...
lsswap.parts
So, it looks like i would need to possibly extend the wiring/fuel lines in order to adapt it to my chassis, but all the "figuring out/sorting out" has been done. It does look that easy---at least from initial observations.
Considering it's already pulled and setup with ECM, wiring, and fuel pump wise, i think $3700 is an ok deal; i priced out just the engine alone at salvage yards and some wanted $2000 and then you'd still have to get the computer, harness, fuse box etc.
But, something weird/wondiferous happened today just out of chance; i think my problems may be solved. i don't want to mention it right now, a) for fear of jinxing it, and b) so as not to come off as bull's hitter. i will reveal all when they're done with it.
i am still turned on by the LV3 though; The "old style" 4.3's like the one i have are about 425lbs. The LV3's are all aluminum---heads AND block, so i'm thinking 360lbs. ish?
285hp/300tq in a 350lbs package. Also, it's already E85 compatible which will make close to 300hp.