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Larry,
First thing is to NOT throw away any old fittings. Remove all the hose material from the fittings. After getting the fittings very clean find copper tubing that just fits over the original tube. Use wet & dry sandpaper to get the pipe very clean. Slide your piece of copper tubing over the short factory tube after coating it down with electronics flux. Comes in a can about the size of chewing tobacco. Clamp the fitting in place using very little space on the fitting. The clamping will act like a heat sink & take away heat, we don’t want that. Get it smoking hot & right at where the new tube meets the old touch the solder to it. If hot enough the solder will be sucked up inside the two tubes & get off the heat fast. Do NOT touch or move the fitting until it has cooled & turned dull silver. After you have added 1/2" of pipe on the end the fuel line rubber tubing will slide on all the way to look like factory fittings. Be sure to buff them up to look nice too. A guy can run clear tubing between the three carbs to see if the pumps are working. Don’t worry if you see bubbles too. Keep that 800 it is one of a kind & very fast for an early 6. I use black zip ties to crimp the tubing to the fittings. Saves you money & looks good too!! 😀