Is it just a carb swap? I have a BF 75 with a bad lower unit and a BF 100 with no compression. I plan to switch the powerhead from the BF75 to the body of the BF100. The BF75 is a long shaft,nasty looking motor while the BF100 is in beautiful condition(except for no compression). Will the BF100 carb switch to the BF75 therefore giving me the extra HP ?Or is there more to it than that?