Wow! I think they hit 6200 rpm on the second pull to boot!
Suddenly, with that engine, you will need to overhaul the entire drivetrain as well, unless u want to hear break, snap, & bend.

those engines are serious, i have seen a couple on thirdgen using 4.3'* in fbodies even. sounds like a GN though, no mistaking that for a sleeper

i didnt listen to the vid before, you can tell by the sound its a monster cam big head NA big block

Boy that does look like a 4.3 with a marine intake on it. Tubo'd even. That thing should scream like a bitch.

just think how fast your vortec would be if you put a marine intake and turbo on it.

I'd be happy with just a marine intake on it. Injector upgrades are possible then. More power baby! Wish they made marine intakes for the Vortec 350'*.

Still could be a monster small block IMO.
472 Big Dawg Small Block Chevrolet Crate Engine

Wight estimates are off. A Small Block 1/2 ton 2wd is 5,200 pounds or less.

My 4WD 6.2L Diesel Suburban was 6,600 pounds.

As for going 12'* with a 73-79 Small block chevy truck, I have drove 2. One a built 350, the other a Built 383 (only GM part was the block). Both compete rust buckets.

there are in fact. i think mercruiser uses alot of vortec 350'*

http://www.s10forum.com/forum/f10/ma...intake-507421/

aftermarket spread bore adapter
New 5 7L 5 7 350 Marine Engine Vortec Intake Manifold 5 7 5 7L 350 V8 Marine | eBay