5.3 in a 97 is almost a bolt in swap. advance adapters 1" set back mount adapters and a 6.0l flywheel w/ spacer plate makes it drop right in. exhaust manifolds drop into the frame like they were ment to be there. Fuel pump puts out enough pressure and flow for the new motor. fan even fits into the stock shroud. Use 01-06 silveado upper rad hose and your lower can be made to work. silverado throttle cable as well. only mod is the wiring harness. Use a 2000 camaro ECT sensor and connector so you can hook up your temp gauge. My total cost of a 02 5.3 into my K3500 was $1754 but I did all the work myself. That was motor swap, new fuel lines, and sendng unit, adapters, exhaust mods, hp tuners credits etc.