Hate to tell you though,if you have to do a tranny swap it can be done in a day or less, no need to touch the topend, and you only need 4 gaskets.. turn engine upside down, remove dyno, shifter & clutch cover, unbolt lower case, swap shafts. Dont forget there are a couple bolt on the top side.
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True, with the engine out the tranny can be swapped in short order as 754 describes(don't forget to take the shifter mech. apart). Once the lower case is removed, the tranny can be replaced pretty easily without disturbing much else. There are a few seals and o-rings you may, or may not, want to replace while your in there as well as check the primary chain/tensioner.