What would be the best engine to droop into a 1968 mustang?

What would be the best engine to droop into a 1968 mustang? - 1

Added (1). What would be the best engine to droop into a 1968 mustang? I'm planning on buying a straight 6 1968 mustang and I want to drop a V8 into it. What would be the best lowest cost engine that would drop into the mustang with no adapting? (I don't care is the engine is even a ford engine I just want more power)

An electric engine.

What are you doing for a gearbox and differential?

All very well putting a big block engine in there, but all it may do is shred tires and spit out gears.

A 302 Windsor is a good engine in that car. Common as, plenty of go fast extras, and you can pass the car off as "standard" because they came from the factory with that engine. Because the car came with that engine as an option, the parts you need to make it fit actually exist.

Well not an ls most likely a 5.0 from the gt or if you want even more power a 5.4 liter Shelby gt500 engine that would be unique and interesting!