Have an Offy dual port manifold, plan to mount a Holley 390 (8007?) on it. The carb is supposed to come ford throttle arm. Question: what will I need to order and have on hand to install the carb? Will the stock throttle cable work? Is a 4-hole spacer worthwhile?

77 F250 400m C6 3.54, it was Dad's
81 F250 4wd 300six t18 3.54