Once again I am looking for some engine help as it seems I can not make my mind up.  I am trying to decide if I should move to the dark side and install a 302 or have my 272 rebuilt.  My main goal is 300+ HP along with not breaking the bank.  Is it possible to get 300+ hp out of a 56 272?  Fully understand that the engine must first be checked for cylinder wall thickness for boring but is 300hp within reason for a Y? 

Engine is stock, runs great, does not smoke or burn oil and runs 3000 rpm and 60 (3 on the tree).  The  heads should be ECZ with 1.78 but understand they can be worked to 1.92. 

As always any and all input is appreciated!! 

Warsaw, IN