You can use the stock siamese port head, only the non-integral head though. But you will need to prep the head by installing bolt-in lump into the intake ports, and installing larger valves and porting. The stock block and crank are fine. There is a thread on here that contains a very thorough dyno test session for the 292 done a few years back that contains much of the needed info you are seeking. So if you do a search, it should pop up as to the parts used to reach the goal you are looking for.
