I think you have to do your homework and make sure it's a 427, check the numbers on the block, heads and intake. it must be cross bolted, it must have screw-in freeze plugs, it must have the side
oil galleries. Also, it should not have ribs on the sides, if it is ribbed it has a service block (post 1970), also look for any visible defect like a crack around the freeze plugs, etc. All this checking should give you reasonable certitude that the motor is what it is supposed to be. As far as the condition, pull the plugs and see if it turns freely. A good 427 Sideoiler block alone will cost you 3 to 4K. I forgot, the patina is important: dirty, a bit oily, faded paint and bolts looking like they have not been messed with! The rest is a gamble, if the price is right!!!!!!!!!!!!!!!!!!!
