Biggest PIA is the wiring, everything else is easy. You can have your D-series out and the H22 in the chassis within a day. I had Neal do my harness, did a great job. If the car isn't your DD. Pull your D-series, have someone reputable like Neal convert your harness to work with the H22 and then make a weekend project out of the swap. Don't skimp out and do shit half assed. Spend the extra money and get quality axles, a "real" radiator, etc.. Once you have everything throw it in and enjoy

-Mike