I agree... while it can be done, usually it takes much less time to pull the motor than it would to fight with it to "try" and do it while still partially in the car. It's really hard to do it that way even if you've done it a few times.
Not all that much involved on pulling the motor on out cars... prett easy compaired to newer cars!
Good luck, take your time, think things through and don't cut ant corners... you don't want to do this again, you just want to drive and enjoy!
Brett - 67 Drop Top 455! (much the same project planned for this winter!)