Last year I completely lost my mind and did a HCI swap and added the blower on my '88 vert.
Before that over years I had tinkered and tweaked the engine to making pretty decent power with the stock heads, cam, and bottom end and Speed Density.
Here's what I had going on:
I added an Explorer upper/lower intake with 1/2" spacer, Ford Racing 65mm TB ,March Perf Ram air intake and underdrive pulleys, electric fan, FRPP ceramic coated shorties, Catted Bassani x pipe, 2 chamber
Flowmaster cat back. I also had FRPP aluminum drive shaft,3.73 gears, 14 degrees timing.
The car made 240rwhp, 299rwtq on a Dynojet. That was with all emissions in place and speed density.
Really felt like a rocket!
Good Luck, I hope this info helps you with your future upgrade plans.