Sorry for replying to myself, but, in reference to the $100 ported cylinder for the GT5, they say the following:
I really think all the jugs come from the same casting pattern. Fred and others port/machine them some, but the basic dimensions are all the same.
I'm a newbie and do not know this for a fact. In any case, from the quote above, it sounds like setting up the port timing for our engines typically involves some inspection and testing and adjusting the height of the jug. And if you get someone to do custom machining for you, it's gonna cost $.
Again, I'm speculating, but the cheapest way out is probably a cheap jug + a handful of base and head gaskets + glass + sandpaper.
Or spend $100 for a new Fleabay kit and use the new engine.
Please, someone jump in and correct me if I'm off base. I may eventually have the same question/issue as Hell On Wheels.