i am new to the hp tuner world and ls1 world. i just did an ls conversion in my 65 impala with a 5.3 from an 02' avalanche. obviously i am not doing rear o2 or cats and did away with the drive by wire setup. i am doing headers and 3" exhaust. stock intake with a 4" cold air intake. looking to see what i may need to change when i get into the computer. any suggestions on what to change and where to change it are appreciated