[71cadc10]

I've run the deka 80's on E85, at 610 rwhp. They were around 80% duty there...at 60psi rail pressures.
so I agree...if you want that kind of power, you would fall short with those.

I also caution that kind of power, on a 5.3 if you are running stock crank. You will be on borrowed time....use of the best rods and pistons you can get, will stress the crank more under full power....it's going to move around a lot...about all you can do is set the main bearing clearances looser side.
I've run a stock crank 5.3 at 1000rwhp+ thru a stalled 4L80...everybody on the internet says they are fine at 1000hp...they are fine for a couple bonzai pulls...but long term it will tear up mains due to crank flex. If you tear the engine down regularly for a refresh/inspection, you can maybe catch it before any real damage