Just picked up and fairly clean vk calias 5.0 of a mate of mine. The motor is a lil tired. Mainly the top end is rately. The cars on gas and its my daily driver so dont want to spend a fortune on just get a lil more power and know that its reliable (id rather spend the money on my rx4). So i need to put new heads and valve gear on mite chuck a cam in while im at it. So whats my best option? I was thinking of geting some ported vk heads for, so how much do they go for? Or i could put a set of vn heads on it whitch means i then have to put diferent extractors and inlet manifold, how much will this cost? Is it worth going to the vn style heads or stickin with the old schoolers?