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LM4 5.3 with 241 ls1 heads, ls6 intake and a BTR stage 4 truck cam dyno guess?
Going to be taking our project truck to the dyno this next month or so. Anyone dare to guess what it will make? Truck has a 4L60E and a 3200 10" converter.
BTR StgIV Truck Cam is 224/230 .553/.547 111+2 which should do well with your stall. And the LS6 intake should be plenty for this out to ~7000rpms if you have the valvetrain for it.
That air filter appears to be tiny, which is not going to do you any favors, and I do not have any idea about what sort of exhaust you are running. Or what sort of fuel system.
So, given the information provided, I would agree with KW, and wager between 150 and 750 hp to the wheels.