Opening up 318 ports to 360 size

Yes, how's the rest of the build. You'll probably be somewhat surprised with the Street Dominator, every one I've experience with on whatever "street" engine with a 106-109 LSA cam in it with decent to good heads had really strong midrange power from 2500-6500 rpm. But that's also with gearing to match. The 318 sized runners will down tune from that a few hundred rpm on a larger engine but there are worse intakes to have laying around to be forced to use. I'm running one on my 318 (stock heads with 3 angle valve grind) by choice right now. I'm happy I have it but am really looking forward to some gears...