So it's basically a LMP1 engine already in all but name?
Even the aluminum Ford 351 SVO block retains all the stock dimensions and other items that the steel block did, seemingly so hot rodders who are sitting on boxes of 351 Windsor parts can use them to build up a light weight engine:
https://performanceparts.ford.com/part/M-6010-Z351
This is basically the engine block that Panoz used in their LMP1 roadsters, cut down to have a 302/5.0 deck height.
Basically the same stuff that Nissan did to the VK45 to make it into a Super GT engine was done to the Caddy engine. Only more extreme example was the Ford small block Indy Car engines: iron to aluminum block, wet sump to dry sump, and ultimately OHV pushrod 16 valve to DOHC 32 valve.
I think that the discussion on the Cadillac engine should also be taking place in the DPI thread, because it should be of interest there. But it does seem that the Caddy V8 is the most LMP1-like of the current DPI engines.