http://www.bgsoflex.com/auto.html http://users.erols.com/srweiss/index.html
heres a coupla links with some calculators on them. I dunno if your handy wit stuff like java, but they might give you some ideas
Its nice to see some math up there delving into the nature of the beast
BTW, I dunno if you addressed it but Ford heads typically have in the area of a 5 inch long intake port so adding this into the runner length helps
ie; the TFS street intake would have an intake runner of 15" plus a 5" intake port for a combined runner length of 20"
[This message has been edited by MiracleMax (edited 10-09-2001).]