[MJN]

Originally Posted by mr48chev

If it is in good shape it should be a bolt in.

It already has the bracket on the front for the front motor mount.

As MNJ said you really need the suffix code to tell exactly what it left the factory in.

I'd want to paint it the correct gray or blue for an AD engine but that is my personal thing. Engines like this with off the wall paint jobs always make me ponder a bit. If the rig it was pulled from is there and the paint combo matches or jives with that paint that takes a lot of the pondering out.

Still actual condition and what the seller can document to as for it's internals and miles. mean a lot on price.

Not all timing gear plates were drilled for motor mount holes. This being a 55-57 block it has the bosses for the side motor mounts (see picture of the GM casting number) and won't have holes for the center mount as shown in the attached photo. The 54 and earlier blocks did not have these block bosses and used the front and center mount. Over at Stovebolt they have some tech tips on modifying the front timing gear plate to use the front mounts.
https://www.stovebolt.com/techtips/motormount_235.html