i have a set of DO0E heads to put on my 289 and when i took them to the machine shop today the guy was telling me all the work involved to make them work well with my motor. then he tells me about a set of 289 heads the were left there and never picked up. says they are ported to the absolute max and were done for a customer who was gonna be running a stock eliminator class. exhaust ports alone are about twice the size of the ports on the DO0E heads. since they've been sitting there for a while he's willing to sell them to me completely bare for $250..so do you think it would better for performance to just get the DO0E's worked or get valves, springs, and rockers for the 289 heads for about the same price