Help with block ID

[EZ Nova]

Sorry to say, it's nothing special, but this was the motor in my 1969 SS396/350 4 speed car when I got it.

3999290
GM 10 T
J 28 72

It's a 4 bolt block. Standard bore.

That's all I can find on this motor. Now it did get a new from GM:

Steel Crank, std. std.
3/8 "dimple" rods, I put in ARP wave lok bolts
Pistons are 3969974 with C/A file fit rings.

The above has about 600 mile since the new GM parts, and the rings, bearings and rods bolts have less then 20.

I was wonder what it's worth?

I was and did a couple of time race this motor, but once I found out what it was, and seeing everything inside was standard and reworked, I bought a 427. It was built to 375hp specs from what I gather.

Thanks, John