Anyone have any experiance changin engines?

I have a 4.2 v6f150, and will be changing to a 302 very soon.

Anyone know of any little things i need to look at now, or i may overlook?

one question i have now, is will this bolt up to my current transmission? I know people pushing thier 5 speed manual with more power than this engine, so i will be okya if it'll bolt up.

the engine will prob be somthin close to this..
http://www.fordcobraengines.com/302_...elInjected.htm