I received this engine in a purchase of lots of parts. The following is all of the information I have which is reflected in the price.
Long block
Factory 400 block #3951509
4.125" bore
Billet 4 bolt mains
Deck & heads are o-ringed
Steel crank 3.625" stroke
Aluminum rods
JE big dome pistons 15:1 or more compression
Brodix 10x heads with one repaired combustion chamber
Jesel belt drive
ATI Damper
M-55 HV oil pump
Milodon full sump oil pan
Solid roller cam(unknown specs)
Missing nuts for head studs, rocker arms and pushrods to be a complete long block.