That is if you can find buyers. Selling used stuff is difficult.
There has never been a better time for buyers and sellers to connect. Are you old enough to remember a time when the only way to reach buyers was to pay for an ad in a newspaper? With Facebook marketplace you can reach a much larger audience for free.
Anyway......I've parted out both a Yukon Denali and Cadillac Escalade......its very easy to sell parts since many folks want to upgrade the wheels, interior trim, steering wheel, front clip, seats, stereo, etc. on their Suburban/Tahoe/Yukon with the more premium Cad and Denali pieces. It's not at all hard to get a known good running engine and profit $1000.
Some guys end up having to pay a junkman to take the heap off their hands.
Salvage yard will pay $100-$200 for the carcass depending on weight and scrap metal price. If you are paying someone to take it away....you are doing it wrong...lol.
Plus some areas you can be fined for having junk cars sitting in your yard.
Not in my area.....but yeah I'm assuming the OP is not living in Beverly Hills.
A decent cam and 059 vortec will wake a 305 to 300 hp easy.
The OP said he wanted to go fast.
However, it seems you already decided on an LS swap and created this thread for confirmation replies.
I didn't create this thread.....but the OP did express interest in going with an LS and he has experience with the LS (mentioned a C5 build).....I'm sure he understands their potential.......seems like a no-brainer to me.