The following is probably the best dissertation of the design parameters built into Ford’s poly angle cylinder heads and lots of other relative information on the basic engine design which serves even today as the pinnacle of automotive pushrod V8 engine design.
Interestingly the author...
Maybe you don't, but I sure do! Can you guys chime in with your knowledge here? Why they seem less popular, do they make reliable power, are they based off of another block, certain years to look for, are they still made, etc.
Any input appreciated!