Hey I got a bone stock 2.0L mazda/ford motor ( was made in 84') and It has a 2bl carb. I had ordered a stock replacement from autozone but they've basically screwed me on that. Not many places online sell the carb if any because of the low demand for them. I was wondering what type of modifications would have to be made in order to put lets say a holley 4bl carb on it ?? Thanks for any help.