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I seem to recall reading the head bolts for the this series of engines were not propperly hardened and caused several head gasket failures during the 1968 season. Before they discovered the problem the Boss 302 engine was on the horizon. I can imagine the pushrod tube being in the center of the intake port would hinder its effieiency. They attempted to run the RPM scale up considerably and ran into valve train reliability issues also. Essentially a lateral engineering idea from the FE Tunnelport. Neat concept but .....
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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