hi just wondering if its worth putting my high port intake cam into my low port head and what gains will this give teamed up with a 2.5 inch straight through exhaust and decent intake system? not after exact figures just a rough idea thanks

You should see a gain by replacing the intake cam (5-7 quoted), as seen in this post:

http://www.sr20forum.com/technical-information-library/76933-how-do-i-have-low-port-high-port.html#post816145

thats not to bad then also im running my low port engine on a ecu off a serena people carrier any mods i can do to this ecu? or just ditch it for a gti one?