The record may not last long. The Hennesy Venom F5 is due out and that is supposed to hit 300mph.
I know the Venom F5 is supposed to be faster. Maybe they had to do this before the F5 came out so they could hold the record for a short time.
Read an article about this Lotus chassis, carbon fiber bodied monster selling for 1.2 million per copy. It has a turbocharged 427 but couldn’t find out what make. I assume it is a big block chevy with aluminum heads to optimize airflow and keep cylinder head temps down to counter turbo heat generation.