David...you are correct, Sir...the heat shield is from a 1970. I swapped in the 230 "as-is"...in its original 1970 configuration. It has an obnoxious exhaust leak which has prompted me to replace the manifold gasket (progressing nicely...should be done by this evening). The leak didn't prevent me from taking Charlotte out and driving her for a shakedown run of 50 hiway miles. The 230 stumbled some from idle up to middle RPMs, which I believe may be due to the leak. The original Monojet carb from the 250 is going on the 230, and I am removing the non-1969 items like the CCS solenoid and the anti-dieseling solenoid, but I am considering keeping the heat shield as I think it's a good idea and may improve the car's drivability in summer conditions.
Thanks to all for your kind words. I think Charlotte is going to attract a great deal of attention due to her now unusual drivetrain. I am glad she is appreciated on here for her originality.