[SupraDupra]

Wont need the head milled again unless you have been putting some seriouse stress and heat on it. Double check it with a straight edge ,but you should be alright. As for removing the tranny or not ,I always leave it in ,others swear by taking it out. It all comes down to personal preference I suppose ,but I have large hands also and found access to the mounting bolts on the back to be fine with the head removed.