well do you have the headers and the heads? if you do.. slide the exhaust ports out toward the side of your bench, bolt up the header and stick a spark plug in there.. see if they will clear or not
You will have to cut down a plug socket and use a wrench on the end of it to get the plugs on cyl. 1,2, and 3, plus use 90* boots on the wires, but other than that, no probs.