Help me add 100 hp to a magnum 5.9 on a super tight budget

I like being a copy cat sometimes…

Stock 5.9, M1 single plane, 750 cfm carb (Holley preferred) 1-3/4 headers, Comp Cams copy cat 380/360 crate engine cam that has more lift.
Add minor head work so the valve retainers clear the head. Give it a milling for a .5 increase in compression.

Change the stall on the converter to match the 4.30 gears and go clean his clock with an extra 100 shot of N02. You’ll clear 500 hp.
Yeah, except you’re talking about dropping 2-3000 dollars into it. He said he has no budget. I’d go with NO2.