I doubt you will loose that much HP with the Weiland intake. The CHI intake is more of a high rpm intake and the Weiland is more of a torqer intake so it kind of depends on your rpm band.
BUT.....I don't think the Weiland will fit. That was what I got for my build but the intakes on the CHI are high port. I had to get a high port intake such as the CHI:
http://www.tmeyerinc.com/400stroker.html
And It will stick up ALOT higher I am afraid.
Gary
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