03Stg2Roush

I've been thinking about finding a 4V engine and swapping it into my car but I was wondering what's less costly and more worth it.

4V engine swap?
Or 4V head conversion?

I was also wondering what all is needed to swap 4V heads on to a 2V 4.6 in the way of engine parts.

If it's cheaper for the 4V swap to get the same power I may just have to buy an engine.

Aereon

They'll both cost you about the same, getting the engine will be easier as you don't have to fab much up. Your better off buying a built block and supercharger as it'll come out to the same as a 4v swap and you'll end up with more power.