Ayuh,.... Looks to be a plain ole GM Goodwrench replacement motor,....
Pretty much exactly what the 305 long block I recently replaced is, only from Pace, insteada Jegs,....
They've all got composite head gaskets, not steel shim gaskets,....
They've also got ssteel core plugs,
see my recent thread 'bout such,....
The cams are standard production, just like in a pickup,....
Dress it up, drop it in, align it, 'n Go boatin',....
No warranty, but so what, GM's quality control is pretty good, 'n the SBC is a proven platform,....
Usually, new motors I've seen go Bad, are from reasons other than the long block,....
Like if a lean condition detonated, 'n killed the old motor, the new motor ain't gonna last very long, unless fed plenty of good clean fuel,....