I have as cast KRE D-ports on my 455 with a slightly larger cam (232/238/112). I am more than happy with the performance of these heads out of the box, direct from KRE.
I don't think you'll be disappointed in not doing the 290 port.
That said, I'd like a little more out of this engine and spending the couple hundred extra at the time of purchase to do the 290 port would have saved me money in the long run, as I plan to have port work done on these heads. So my advise would depend on if you're wanting to grow further than what the as cast head can do for you, knowing that manifolds need replaced with quality headers to see the benefit of that extra porting. If this is a one time deal that you don't ever intend on opening back up, and don't intend on going to headers, there's no point in doing the porting IMHO.
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-Jason
1969 Pontiac Firebird
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