340 TA Heads....

67Dart273 said
I always assumed folks used "good procedure" (preheat) and brazed the original holes

And that’s a problem!

Sure would'ha been nice, "let's say" when Ma built the 340, "she" had redesigned enough stuff to eliminate these kinds of problems. Instead, what we essentially have, clear up to the Magnums.........is a 273 block...........

It would have been nice if they went from the Poly straight to a 48* race block!