Doug, the engine you're using is the turquiose one in the photo? Just leave it un-wired.
My current project ('71 duster 340) was started in '99? (I had been building non stop at that point for about three years, completed about 10 builds) I painted the body then and put it away. Didn't do 'any' modeling until 2011 which was building the engine (single 4-barrel) for that car, everything except the decal for the air cleaner. Started modeling again about four months ago, one build completed, one not. Then I started on the Duster again, and , screwed up the air cleaner decal. got another decal and screwed that up too! So I thought " I can't do a 'stock' build without the air cleaner decal " and decided to put on the 'Six-Pack' intake. The engine is now finished and am putting in the rear-end stuff now. Should have the under body stuff all done in a few days, maybe today in fact. Wheel/tires are ready. There you go, a 15yr build! Wooohooo!