original or custom for the resell? your vote/thoughts please

the more time and money you put into the car less likely of getting it back in the sale...I say fix the 273 heads or if any change go to the later model unlead heads and install, just verify the bolt angles.....get it running, after all, you just going to flip it...to do the work you talk about makes me think you got feeling toward the car and would rather have it for yourself..decision time..