273 needs new heads, suggestions

You'll have the same money if you rebuild your current heads or just about any other factory head. If your goal is a 360 down the road, I would fix what you have now and focus on building a 360. Keep in mind that 360 heads have larger chambers valves and ports. While bigger valves are almost always a good thing, the larger chambers will hurt compression, and the bigger ports will hurt low RPM throttle response pretty much cancelling out the gains from the bigger valves. Sure, you could modify 360 heads to work well on a 273 by milling to reduce chamber size, but then the chambers might be too small to work well on a 360. The Eddy's are great heads, but on a mild 273 you won't gain enough to justify them.

If you planned to keep the 273 I'd suggest looking for a set of the late 318 "302" castings and putting larger valves in them. But you could get nearly the same results with your current heads. Best bet would be fix what you have now and grab a 360 Magnum out of a junkyard and start building.