Theres No Difference Between EFI And Carb Cams!!!!!
The intake is probably the best bet $$$ wise. You might like to pick up another cheapie alloy head, get that recond with bigger intake valves, get the exhaust cleaned up, and have it port matched to a high performance intake manifold for the Weber carby. That way you can still run the stock airfilter on it, which will generally dissuade the coppers from taking a closer look under the bonnet (when you get pulled up!). Or, if you feel like a bit of yakka (carb linkages, fuel lines, that sorta thing), i'll sell you my twin carby manifolds i've got sitting around (i'm in Lesmurdie)
D&S in Kenwick do an excellent job, i've had several jobs done by them, all were top stuff.. $200 for a basic recondition, then add more $$$ for fresh valves, etc etc..