the 4bbl stuff is holy grail kind of finds. long block is identical, same cam, pistons, everything. If you use the 4bbl, make sure to include the oil cooler with it( they put it on those motors for a reason). I like the q-jets, the biggest problem I find is the throttle shafts wear out(they make a kit to fix them, but you better know your carbs). you should get better idle, acceration, and fuel economy(if you stay out of the secondarys) with the 4bbl over the 2bbl, especially if you have the merc carb, When you get it all back together, install a pertronix ignition(replaces the points), set the timing no higher than 5 degress btdc and ride. I allmost forgot, does your present engine have the 3" or 4" heat exchanger, if it has the 3", look for a 4" to replace it(hope your spare does)
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