I am JEEP freak................ Every one of my friends who have an older JEEP has converted their 4 cylinder engines with Chevrolet 350. I myself have a 89 JEEP Grand Wagoneer with an AMC 360 in it. I do not quite understand what you mean by "How would you get it to fire"??? If I am not mistaking the 87 Jeep has a throttle body fuel injections system. You can easily convert to carborated and you need none of the wiring and what not. I also have many pics and sytes you can look through.