An engineer friend of mine had a neighbor down in SoCal (also an engineer) who had an old Ford with the 300 inline 6 in it... Running on propane with 2 aircraft superchargers on it and a hand carved wooden throttle body/carbureator thingamabob. It was crazy fast, he said the guy would just tromp muscle cars with it just to see the look on the owners faces when they saw what it was running.
I had an offer to buy my truck from a neighbor so he could soup up the engine. I don’t know much about it, but he said you could add a huge nitros system to the engine in about 20 minutes, double the horsepower and the truck would not notice the extra stress.
I sold the truck a year later because I was tired of putting brakes on it and the master cylinder had seen better days. I was also promoted and got a company truck (a newer F150, 4.6 V-8).
When I advertised for the truck, I did get a call from two people who just wanted the motor. They didn’t even talk about the price. I asked why they just didn’t buy the truck and take the engine out themselves. Still baffles me.