Chevrolet Repair: 99 5.3, chevy 1500, fuel mileage

Question
i have a 99 chevy 1500 4x4 with a 5.3 will a 2000 5.3 work in a 99 if i swap intake and injectors i know the timing is different and the injectors are bigger in the 2000 5.3 i am thinking the timing is more advanced for the bigger injectors i think i read the 99 timing is 14.1 and the 2000 5.3 is 15

Answer
HI CHRIS,DO YOU MEAN WILL IT FIT,YES SIR. BUT DO YOU REALLY WANT TO DO THIS,YOU ARE GETTING INTO A LOT OF WORK. BY THAT I MEAN THERE MAYBE MANY SENSOR CHANGES THAT WILL NEED TO FIT THE WIRING HARNESS AND ENGINE BLOCK. THIS WOULD MEAN YOU WILL NEED TO REPLACE THE HARNESS AND ALL SENSORS WITH THE PCM AND REPROGRAM IT..THIS IS ALOT OF WORK..I WOULD SUGGST GETTING THE [SAME YEAR ENGINE] AND SWAP IT OUT LIKE THIS, OR CALL YOUR LOCAL SALVAGE YARD AND [SEE IF THESE ENGINES WILL INTERCHANGE.] THEY WILL HAVE ALL THIS INFO AT THERE FINGER TIPS. AS FAR AS THE TIMING I DO NOT KNOW WHAT YOU MEAN ABOUT 14.1 AND 15..THE TIMING WILL BE ABOUT 8 DEGREES OR SO. DO YOU MEAN COMPRESSION RATIOS ?? IF SO YOU ARE VERY HIGH. THIS ENGINE WILL HAVE LIKE MAYBE 9.5:TO 1  RATIO.. THE 14.1 IS LIKE THE PERFECT FUEL RATIO.[14 PARTS AIR TO 1 PART FUEL] FOR PERFECT FUEL MILEAGE..IF I HAVE NOT ANSWERED ALL OF YOUR QUESTIONS GET BACK TO ME AND I WILL ADDRESS THEM FURTHER..I HOPE THIS HELPS YOU..PLEASE WHEN YOU ARE DONE, WOULD YOU MIND RATING MY ANSWER.. THANK YOU,,,TOM...