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The Performer will clear the hood better in some cases especially if you plan on using a Thermoquad. Plus the Performer gives a little more bottom end vs more top end for the Weiand just my experience. Both are good intakes or a 318. As far as the head conversion is concerned I would just swap...

I believe the confusion here is the advertised compression vs "static" compression which involves measuring the compression height and cc volume of the combustion chamber but, I believe your advertised numbers are correct.

Just wondering if a Edelbrock 1406 carburetor is enough for a early higher compression 318 with a Summit K6900 cam, headers, MP electronic ignition, and Weiand 8007 intake? I was thinking with that cam maybe a 650 or a 670 Holley would be better and the largest route to go and offer a little...

I haven't confirmed but, I believe he is talking about advertised compression and not "static" compression. Even the earlier 67-69 blocks should be about 8.2.1 to 8.5.1 static? The later they the worse the compression height became and then after 72 was all downhill.