I've got a 1950 Futuramic w 303? rocket engine. number punched in blocck 508C15991<BR>pls confirm that this is a 1950 <P>To restore my old engine I bought what I tought was a 303 that appeared to be a 324<BR>the number on the bell housing are <BR>563922 and 335<BR>on top of the block is punched V452866<BR>What yearmodel could this be?<P>Can anyone help me out on this.<BR>Are the heads interchangable?