Thanks Spiros (@fiveten), John (@johnb), and George (@gblair). I have a philosophy about modeling which goes something like this.
I want to display certain aircraft, and it's often a long time between builds of the same type. And, being able to display a model of a plane, especially a rare one, is a special treat. I want to have these models have a reasonable amount of detail and at the same time, I want to improve my painting and weathering skills. What I don't require (generally) is for the kit to be perfect and completely accurate (i.e. rivet counter accuracy), nor do I require it to be the latest and greatest (although I really do like these new kits). I figure I can meet those requirements with anything from a vacuum formed shell to a Special Hobby kit that requires a sledge hammer to complete to the latest wunderkit from Eduard or Tamiya. I do balk somewhat at serious shape issues, but it depends upon how badly I want the plane. For example, I build Hobby Boss's Easy Build P-38L Lightning several years ago even though it has serious inaccuracies in the engine cowl fronts. But I really wanted to try out the way they molded the kit (complete upper and lower fuselage halves). So I bought it and built it, working my way through the issues with shape.
Anyway, after that lengthy ramble, I am hoping George, that the vacuum formed cowlings will indeed fit the aftermarket engines. Right now, I'm just waiting until the house wakes up so I can start up the vacuum form jet engine.