I have a 2000 Silverado with the 5.3 engine with 60K miles.The frame is rusted. Thinking about swapping the engine it into my 73.Getting older and want a reliable cruiser that gets decent gas mileage. Been searching and can't find any specific info due to the plethora of info out there. Not looking to upgrade for performance,just economically minded swap. Want it to fit under the flat hood. Used parts wherever possible.