Actually, it was 8 EFI's. They were based on the 2 liter blocks rather than the 2.4's so that the boat could come in under the 16 liter Class 1 rules at the time. Ultimately, the boat ran only one race to qualify for an attempt on the Kilo SAW record, which he got. He may have actually used fewer than 8 2.4's for that run, but I can't remember. It wasn't the first boat with multiple outboards belted together, however. It was preceded by an unlimited hydro with 8 2.4 liter Mercs for a total of 2400+ HP. Kept throwing belts because of belt shaft problems.
Sorry for the OT post, but regardless of the number, thanks for reminding me of it. Al was wild in all regards.