Gee, I had no trouble building a lay-down setup? I even have an A/C core mounted in front. It takes two ca 3" long straps from the stock body mount to the stock radiator bolt-bosses, using factory bolts. If its a Fluidyne, you also need two 1-1/2" copper 90 degree sweat-solder fittings, as most aftermarket rads use straight hose stubs. This requires two more short straight 1-3/8" ID hoses to hook up the copper fittings and rad stubs, & allows the hoses to run close behind a pair of flat sucker fan motors in a Flexilite shroud. They attach to stock or ss underbody pipes. It also needs a shorter top rad cover. So its not quite an eyes-closed-drop-in installation.
Note- the lay-down rad setup makes NO difference in cooling- it's simply more convenient to tighten hose clamps and fan wiring without tearing up your hands on the very rough core. Several Nor-Cal guys run a Fluidyne & sucker fan shroud with the rad etc mounted straight up as-stock.