Thanks chaps, I've had a closer look at what I've got, its a 410 head, which would indicate F2, but, the inlet stubs are 36mm diameter with a 38mm lip, I would have expected 38mm stubs, can anyone confirm the diameter of either K0-5 or F2 stubs??
I'm tempted to turn the carbs down to 36mm and use fluoro lined silicone hose, I recon witha couple of 135 degree bends I can make the 4 connectors.