expert help needed (my first post)

Welcome!

You should include a picture of the car!

The 440 will fit but it will be both tight and more expensive to put in than say a larger small block. You’re going to need a whole bunch of big block specific parts like motor mounts, pulleys, brackets and the big one will be exhaust. If you can even find factory big block exhaust manifolds for it they will be expensive - read 1500-2000$ for the set. Equally pricey headers from tti exhaust are also an option. You will also need a transmission for the 440 and if you want a 4 speed those parts and a 4 speed conversion is also VERY expensive.

If this is your first foray into a muscle car and mopar I may suggest leaning toward a larger small block like a 360 or a stroked 360 if you want more power. It will make your life easier and be less expensive. You can re-use much of what you have now.

As for the value of your 1967 barracuda it would depend on weather or not it is a factory formula s car or just a plain Jane barracuda. Either way they aren’t overly valuable in my opinion. Don’t get caught spending too much on this car, but do improve it and make it fun for yourself