I want to swap my 90 integra engine into my 91 civic si. First I have to get a manual transmision, shift linkage, manual axles. What I'm not sure of is can I use the wiring harness from the si w/o touching anything, just plug and play? Also can my rear disc bakes get swapped too. I hate to get rid of my teg but I'm trying to see it as it is being reincarnated into a better civic.