A nice turbo setup can work well on a stock 302, if all the air/fuel stuff is proper etc. Many have built there own setup without a kit, and ended up much cheaper than the poorest kit/brand etc.
I'm way past the current best thinking, a late 5.0 engine swap. That can evidently be done for $5k or in that range, depending on the donor parts costs. I would gladly do that now if I knew the costs ten years ago. I'm trying not to think about that for my old Ranchero, which really needs to have Cleveland heads. But it's hard to debate a more expensive older combo, versus a late model used engine that's less.
92 Mark VII LSC SE - soon OBDII and 4R70, GTC kit and 347, custom paint.
98 Explorer Limited project to add 4WD, XP8 parts, KB blower, paint, 337.
99 Limited mail vehicle, SOHC 4WD, later 306/4R70W swap. 1998 Mountaineer spare. 72 Ranchero 351 Clevor project.