383/496 6 pack Build
Remember that the 6 pack is rated at a 2 bbl. rating which converts into 935/950 CFM worth of 4bbl. rating. The next issue you should look at or think about is the 6 pack intake is a dual plane that will flow around 300 CFM prep'd. The intake should out flow the heads for best performance.
The last And only thing I see a problem with is the cams specs.
There are none except the expected centerline. Whatcha gonna run?!?!