Those components will be fine, but I have an M-ATX G1 Sniper M5 board in mine, and I don't think I would dare fit another 670 simply because the cooler of the card would literally be 1-2mm away from the PSU which I don't think will do airflow any good.
This pic shows what I mean (I have changed the PSU since this pic but the sizes are the same)
No MATX board aside from the Gigabyte sniper allows decent spacing between the cards for sufficient cooling for powerful cards and the 350D is not really a high airflow case.
Watercooling them is really the only viable option unless they are reference blower type cards but even then they will struggle.
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