Given the cam and the existing performance I'd say if you don;t have "all the money" to properly convert - then have the 2.02s put in with a good 5 angle valve job. The cam you have is not maxing the heads you have. So the RPM port will help, but only to a point. IMO - not enough gain from the weight loss and the minor low lift flow to be worth risking the entire pacakge on the heads having an unforeseen problem out of the box. I'll always run aluminum if I can, but if you only have $1600, IMO you don't have enough to run them. Spend on bigger valves and som porting on what you have and pocket the rest until you have $2800-3k for heads, correcting them, and rockers.
