First, stop listening to the usual troll farm dwellers who comment on half read posts.Sorry if I completely miss the mark with this question, and I'm wasting your time. But, would a cam from an 8th gen f150 work or should I try to find a 5.0 Explorer. I live in the Rust Belt, so Fox Mustangs and MK VIIs are pretty rare here let alone any good condition ones. Trucks and SUV's are pretty much going to be my main sources for parts.
Look, the flat tappet camshaft requires new lifters, right? So, $185-$200 for that antique baseball bat, about $100-$125 for a good set of lifters, then roughly $75-$100 for hardened push rods. Maybe even some valve springs to boot but that's moot since you should replace them with any new camshaft.
Now, just ask around and I bet there's a bunch of people on here with left over parts. Stock E7 heads, a good used HO camshaft and some stock lifters. Maybe even some straight unmolested push rods that they'll throw in. What could that possibly cost you? Maybe $100 total? People throw that stuff away!
Buy a quality timing set, install the stock HO roller cam in at about a 111° ICL and enjoy the free power a roller provides over a flat tappet anything. Low cost too!
Maybe you might be able to grab one of those magical FMS "B" cams for a song and a dance and add some "noise" to the engine.
As for an intake, I've seen used older Edelbrock Performer manifolds for under $100 on Farsebook and other such stupid places. Not the greatest intake but much better than the Ford piece.
Again... THINK and RESEARCH what's out there instead of being fixated on using obsolete parts.
Come on in, the water is just fine!