Condo:
VIN on a DZ block is not on the Pad. I had a 69 X33 car and I had to look for it. Is it an 010 casting? Alternately it could be a 388 or a 386. Heads are either 186 or 041 I believe.
The 0318 suggests a march build motor.
I'd guess you could get close to $4500 depending on the casting numbers on the accesories. If it dials in casting and date wise then the dollars are solid.
Check your pms.
Scorp