superior pan and valve cover gaskets
hypereutetic pistons
heads as good as any 340 stock ones
less rotation mass
better factory machining
metric rings
etc
Not sure I buy any of that advantage except the stuff that really does not matter, like gaskets, the LA stuff works fine. Less rotating mass, not much. Also not sure about better machining either. Ever see an engine after a hypereutectic piston fails? Nothing worth saving, maybe a crank. Heads are good but do not flow better than X or J heads, and are very prone to cracking. Plus I like my rockers on shafts with shaft oiling. No metric rings on my 5.2 magnum. Then you have to play with the front of the engine. Remember we are working with a very nice early "A" here. His plan is sound.
