Hi (high?) wire nut,
C4s have separate bellhousings I think - I do know there are some factory 385-to-C4 bellhousings available.
As to durability: probably
It will depend on who builds it and what converter you use, as well as whether you use slicks at the track and if you use a 400HP shot of nitrous
. My (uneducated) guess would be that a properly set up C4 would indeed survive.
Regards,
Tom