I am using the Fly 250LM original chassis that was SW to continue to have the lovely interior. i also added the SCC front axle adjustment blocks which were a challenge to install. I really came close to using the 3d inline chassis, but cutting up the interior is no picnic. I am glad two of use may have challenged the sine qua non for a change.
For this series I am not convinced every car should be max winner stuff. The races have definite big gaps in performance but the cars look awesome.
I do have a Cobra hardtop from a few years ago that I never quite got running. I may order the new 3d for that black beast. It even had side pipes from styrene tubes. I did not know the Daytonas had a 427. My Scalextric 427 1972 (?) Greenwood Radial Corvette has the front motor, but I only race it on my short track.