20,000
20,000 does not sound so bad, If that includes the engine and trans. Ls2 5500, trans 3000, clutch and flywheel, 500ish, pedal assembly to run clutch400, drive shaft 350, alternator 200, belt system 400, radiator450, hoses 40, fan 100, shroud, headers 500 exhaust system 500, computer, 400, engine harness 750. motor mounts labor 1000.
Plus while you are there new brake lines since you did the pedal assembly, you will probabley need to do something to the front suspension, and on and on. From my persective 20,000 sounds cheap. I put a used ls1 in a 62 olds and have more than 20,000 parts and labor.
Rodger
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