289 body with 427 suspension. Referred to as a "hybrid". Currently offered by Kirkham (alloy of course).
The weight (in the case of Kirkham) is virtually the same as the 427 body style so it comes down to which "looks" better for the buyer.
Mention of a small block could easily lead to a fire storm. THAT debate still rages on. It does appear that the USA market is far more accepting of a big block than our English friends. You know it's all about those "loud" Amercians that HAVE to have everything "bigger" than most (especially if their from Texas).
Ernie