the common vortec heads most guys use are designed for the 1500rpm-5500rpm power band and have ports designed to match that flow rate on a 350cid displacement engine, if you've upgraded the displacement to 383 cid then you've reduced the rpm band to about the 1500rpm-5100rpm band making the use of the single plane intakes rather useless as the ports become a restriction even if the intakes not, by about 5500rpm, on the stock small port production vortec heads.
http://www.summitracing.com/parts/EDL-7516/
http://www.holley.com/8502.asp
its almost always a better idea to leave a bit of room to grow in the parts selected, theres no question in my mind that for your application one of these intakes are a decent choice, personally.
now there are large port vortec heads and thats a totally different ball game.
read these
viewtopic.php?f=55&t=2857&p=7492&hilit=206cc+vortec#p7492
viewtopic.php?f=55&t=858
viewtopic.php?f=52&t=322
http://www.summitracing.com/parts/EDL-7516/
http://www.holley.com/8502.asp
its almost always a better idea to leave a bit of room to grow in the parts selected, theres no question in my mind that for your application one of these intakes are a decent choice, personally.
now there are large port vortec heads and thats a totally different ball game.
read these
viewtopic.php?f=55&t=2857&p=7492&hilit=206cc+vortec#p7492
viewtopic.php?f=55&t=858
viewtopic.php?f=52&t=322