Hi everyone.I need a little help from you guys.I purchased a '93 model 454 complete motor from a truck that caught on fire and I was going to just re-ring the pistons and put new main and rod bearings in it and run this motor this summer.But when I took the heads off i found that had afew more miles on it than I had thought and these heads are not real good for power.Anywat my question is can I put a set of closed chamber heads('68) on this motor ?Are they able to bolt up with water passages work?What will the compression be? The only reason i want to use these heads(closed chamber) is because they have been reworked with bigger valves ,springs ,new valves,new guidesand I already have them.Any help would be greatly appreeciated.