BearsChevy

So I just bought a 2013 3500 HD Silverado and the Fuel Pump blew .instead of redoing the whole fuel system on a 300,000 km engine I have access to a complete 2003 or 2004 with a LB7 in with only 200,000 km out of a rollover . Thinkin that a little less horsepower but CP3 pump system . DEF delete already done to LML . Has Anyone tried this before and is it worth the amount of work involved ?