I retested w/ q35 and did not have an issue. Here's the command I used:

virt-install --name q35 --machine q35 --memory 4096 --boot uefi --disk
/home/ubuntu/q35.img --disk q35-seed.img --hostdev pci_0000_34_00_0
--hostdev pci_0000_36_00_0 --graphics none

But, by default, virt-install placed the devices on different BDFs in the guest 
when selecting q35:
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' 
function='0x0'/>

virsh edit wouldn't let me place the device at slot >= 0, so I couldn't
do an apples/apples comparison w/ the i440FX

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https://bugs.launchpad.net/bugs/1849563

Title:
  Unable to passthrough GPUs to guest

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