Depends on if you can find any deals, really. And how many miles you prefer the engine to have. Lower mileage aluminum engines = big bucks.
I found an LS1 out of a 2002 Camaro with 40,000 miles and paid $2500 shipped.
$100-ish for mounts
$500-ish for harness mods
$300-minimum for fuel system mods
Then there's the exhaust system that needs to be modified, possible driveshaft lengthening/shortening, etc.
If you do the bare minimum, like just sump your tank and run a C5 fuel filter/regulator, use the stock exhaust manifolds, etc, it shouldn't be all that much more than a cheap SBC rebuild. But I'd say set aside a good 3-4 grand,
minimum.
BTW, there's deals out there especially in this economy. That 40,000 mile LS1 I had? I had to sell it last year when I lost my job. Someone picked that thing up for $1500.
