Uh, my JF XLR came with vacuformed glass for the front & rear. I've heard its not the best fit though but its close. I haven't started it yet because I realized the build I have in mind is a tad over my skill set at this time.
I like the concept car. It looks like you have the right idea with the flares. I'm sure it will take some time. I hope you stick with it. I'd like to see the finished product.
VGC Resins has a Flowmaster type with no ends on it so you make your own. Its under the "Drivetrain" section for some odd reason. You can email him and he'll check the sizing for you.
I agree 58Impala, I almost bought one from my Sargeant in the Army but he backed out at the last minute. And it does look better as a pro mod!!! Especially one this sweet.
I like your concept. May I suggest using an exotic American engine. The Viper V10! The Riv front end is plenty long enough, and you can get a kit cheaper than an import. Either way, have at it. I'd love to see the build.
I thought about using the Holley for one of my builds but copped out for the attached. I thought about using a large piece of tubing in the center sandwiched between two smaller pieces to get the rounded look. Add some flat pieces to bridge the gaps and then use filler. Good luck on whatever you try. Keep us updated.