Motor swap
Disconnect the wiper motor plug from the wiper motor housing. And protect that windshield motor or take it off.
other little things, pull the distributor before the motor, drop the tranny seperately, drain the block first, remove or loosen and clock the oil pressure sensor toward the nose of car, try to install the pulling chain so the motor is equally balanced. Example, use both front top water pump bolt holes and the top corner bellhousing bolt holes. This will facilitate motor mount bolt removal without damaging their threads when pulling them out. Your 400 crank should already have it's balancer mounted but if not, install it and crank pulley before dropping in the new motor!
Pics and juicy details of your new motor for your forum buddies :cheers:
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