That one is a Water Spider for sure.
I used to race them for a number of years.
First ones I had were from Louis Durand out of the New Orleans area back in the early 80's. (this is when I first started boating when I was stationed at Keesler AFB in MS.)
Most every one in that area of the country ran OPS motors from Sharmock. Then Art McMeans started to bring the Picco
motors in to the country back then.
I used to race against Louis, Roger (possum) (can't remember his last name), Shirley (Louis's wife), Art, Don Pinkert, Jim Youngblood, Scott McGuffin, Doc, Gene Taylor and a bunch of other guys.
Notice the hard shaft on the 3rd pic.
Don Wagners Avergers had the recessed transom for mounting a flex shaft strut to keep the prop the same location as the hard shaft boats.
Then Don came out with the Spiderette. It was the Avenger tub with the Spider sponsons. (made his boats more stable and quicker)
Eventually, Don just called them avengers.
The Spiders that I had were the 20 outboard, the 60-90 boat with OS 90RSR ABN (ran like a scalded dog with minor motor tweaks)
a few with Picco 65's and 80's in them,and a few 40 boats.
Sadly, Don lost all the templates/patterns when the big Hurricane hit a few years ago.
Carl