"SWAP" is not the word that comes to mind when considering replacing the single speed blower fan with a multi speed blower fan. Maybe "an adventure in disassembly, fabrication and wiring" would be a better descriptive phrase for the process.
My wiring diagrams have a lot of extra details for the multi speed blower on the different chassis wiring versions.
As I mentioned earlier the push button start is a easy removal project.
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Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net