I recently got a 1963 F100 Custom Cab short bed step-side. It's all original as far as I can tell and in fairly good shape. I'm wanting to restore it and have two options for an engine swap: a 302 from a 1973 F100 or a 400 big block. I'm looking for opinions as to which way to go with it as far as what most people will like if I ever decide to sell it. I've already started putting it on a 69 frame with power steering and disc brakes from the 73. Thanks in advance for your insight.