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I bought an aluminum Winfield crows foot head a few years back from Red's Headers and was told it was a 7:1 head. The "Non" crows foot head was also sent as a 7:1 head. There was a problem with the hole for the distributor being oversize and the location of the lock bolt hole being too high on the head and holding the distributor off the surface. The manufaturer suggested to put shim stock around the distributor and also put a thin "shim stock" washer under the distributor so the screw would fit into the groove of the distributor casting. As the pistons were quite above the top of the block, I use a stock head gasket, a solid copper spacer and the another stock head gasket. This also require me to make a slightly longer drive shaft for the distributor. For the record, I am using the crows foot head.