tripple SU's anyone...EBAY

That's the pre-2V style. Manifold bore is to run HS-4s on a 144-170 head.

I brought home four HS-6s today. 8)
 
You mill 30° off vertical, towards the spark plug side. Step this mill cut in by a good ½" and furnace-braze a pair of steel plates on with undersize port holes.

Drill and tap the head, gasket match and blend the ports, and it's all over in terms of machining.
 
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