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DukeBecause the SR20DE maxed out is making about as much power as the stock 5.0 is making with 150,000 miles on it. For the cost and effort of making the SR20 swap, a plain easily-built 5.0 could be making a boatload more power. It's simple math.
Wasn't Toronado talking about the SR20DET? Which is making the same sort of horsepower stock not maxed out, but yes I wouldn't do a SR20DET swap on a car like that which stock engine has already good potential.