273 needs new heads, suggestions

Ok so I have had issues for a while with my 273 and I finally decided to have my mechanic take a look and he quickly found my problem. The number 5 cylinder has little to no pressure. He said he put his thumb over the spark plug hole, cranked the engine and it didnt even push his thumb off the hole. He also took a look at the spark plug and it looks brand new, not good. His thought is the valve/valve seat has a serious leak. So I am thinking what options I have to replace/fix this. Here is my thought process....

• My ultimate goal is to swap out to a 360 beast :burnout:, but this is at least a few years down the line
• Would the eddy heads fit a 273 now and in a few years could they be placed on a 360?
• Should I go with something other than eddy?
• Probably stupid question but the eddy heads say, "truly bolt on" But are they really? Do they come with valves, rockers, springs and all that good stuff?
• My philosophy is to upgrade rather than just replace, but like all of you money is always a issue

SPECS: Car was origionally (according to the VIN) a /6 and someone other than me put the 273 in so I dont know what cam it is running (maybe stock?) or any of that bottom end stuff. I have on my '66 Dart GT Convert:

• Eddy preformer intake
• 600 cfm 4bbl
• Mallory digital breakerless dist
• MSD Digital 6A box
• Ammeter bypassed
• 100amp alternator
• 8.75 rear with posi (3.55)
• Ill try to get the numbers off the engine as soon as i can

Suggestions? or Links...