Help with identifying an engine code

I have what I have been told and some preliminary research seems to confirm is a Small Block Chevy. However, I can't find the block casting numbers on a majority of the sites. The rear of the engine on the driver side has the casting "4010207" there is no typo I did not leave off the "1" from what I can tell it was not cast in nor was it removed or ground off. The front has a "G22" casting in the area where the timing chain would be. The rear passenger side has "H36" "201" and "207" and also a "71 CFD." I am at a loss so any help would be greatly appreciated.

Matt

 

i think ya might have a typo on the block i have the same type block in my garage for an 0t project and it has all the other numbers you listed

got this info from here
http://www.thedirtforum.com/castings.htm

1401029
14010207
14010209 80 - 85 350 205 & up 2&4-Bolt mains
Passenger cars

 

nasty Z-28 has it listed as 80-85 4 bolt 350 truck

 

I forgot to mention it is a 4 bolt main. It is bored .60 over is it worth sleeving?

 

oh, can you post the link to nasty site so I can check the data out?