ok i was thinking about building just the head of my 420a, biger cams,adj camgears, titanium springs new valves, stuff like that, would this give me a noticable increase in power if i put a built head on a stock bottom end! or would something give on the bottom end.

reason i ask is i finaly got my project motor, and i want to build the head and if it can give me a bit more power put it on my motor thats in the car now, then when winter comes i would build the bottom end and turbo it, then all i would have to do is swap heads!