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Off the top of my head.....You'll have to modify the fuel line, reroute a vacuum hose or two......and most important, the kickdown/throttle pressure linkage. The 2bbl arm to the carb will be a little short and a little close to the new 4bbl. There are 4bbl arms available, but if you study your current set up and duplicate it with a little fab work you can get it right....and it does have to be right to save your transmission. It's very hard to describe how to modify it over the net. I'll see if I can find some pics to post on what a typical 4bbl setup looks like.