Nice!
I don't think your TH400 cross member is factory installed on a original 6 cyl car.

The original should be a stamped steel. Like this?
http://www.ebay.com/itm/68-72-Nova-67-69...1013a41&vxp=mtr

I know my 6 cyl 69 Camaro cross member is just like the ebay one.

I dont think you could get a TH400 w/a 6 cyl engine, but anything is possible I suppose.
Or Pontiac had them outfitted differently?

That trans should really wake up that 6. Great choice!

MBHD
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12 port SDS EFI