A turbo would be hard to fit (been there done that) to many thing to custom make. A blower would be easier. You can fit a 4agze blower on an aircon bracket in front of the dizzy, give you about 5 pound boast and about 40% power increase with out any internal modifications. Just need to decide what fuel infliction you wish to use?
Alt is to swap the 18R-C for 18RG bolt out bolt in conversion.
Also take look at the thread 18RC hot up in this listing.