the MP Chrome box is a good choice for OE type boxes & the FBO one/coil would be a good setup (its reliability may or may not be good but we are the complaint dept so we do hear about the failures) but it is $$$ & might not pass tech (checkout a pic of it). I would get a '75 OE black HEI module from a chebby from a yard. It is a high powered piece.
www.designed2drive.com has an adapter to mount it under the dist (pricey tho) or mount it on a thick piece of aluminum plate with heat sink paste between the two. Get an E coil.