The only thing you may run into is that the holes are not drilled and tapped
for the front mounts but the machined pads will there.
All you have to do is drill and tap the holes to the same depth. Be aware the front passenger side upper bolt hole goes all the way into the passage for the fuel pump rod. If yours does not have it you may not want to it drill as deep so you dont have to deal with cleaning the chips out of the engine.
I never seen a 350 that did not have the holes tapped. In later years smog pumps and power steering pumps used them. I have seem a 400 that was not tapped. If it is a real LT-1, L-82 or truck moter you may have to modify ft mounts. A standard 70 something pass 6 inch balancer clears fine.
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