906 or 915 ?

44o gts dart said
Quick question for all you knowledgeable people,,,, I am building a mild 440 for my dart,hoping for 450 horse. ,I have a virgin pair of open chamber 906’s that came with block,that I have to redo ,,,, but know of a set of ported and polished 915’s off a 67,,, stainless 2.14 and 1.8 valves,.HD springs, titanium retainers… which would YOU use… and what would be a fair price for the 915’s ( which were just pulled off a running engine ) thanks in advance

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In your case I'd probably have a set of Stealths prepped and use them. Never run any aftermarket head right out of the box. If you must use stock iron you'll probably have the same money in them as prepped Stealths. Design the engine for whichever heads, compression ratio and fuel you decide to use. Design this baby completely on paper before buying parts and starting building.