Need a pair of 409 heads

[Harris57]

I found a 409 motor for my 1964 Impala SS and am trying to upgrade my heads. The original 409 is long gone and I am trying to put a W motor back in. I purchased a dual quad manifold and carbs and had the carbs completely restored by Eric @ Vintage Muscle Car Parts. They are beautiful and waiting to go on the motor. The trouble is the heads are low compression and the ports don't match the high compression intake. The 1964 part number is 3852583 but it seems they are so scarce I am willing to entertain a set of 3814690 62-63 heads if necessary. Anyone have a spare set they will part with? Thank you