I said a ported one. Contact user tmoss on the corral and get a quote to have your lower ported. Stock they flow 200cfm, ported by him they are 240-250cfm which is right what AFR 165 and Twedge heads flow. Not sure what the DART heads flow but if they are sized for a 302/306 I'm guessing right in the TW area.
Edit: Or if you don't want to be down for the time it takes to pull your intake and send it out and then wait for it to come back and re-install it get a $100 explorer lower off ebay or a JY or wherever and have that ported and then swap it with your unported lower.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.