Inliners International Forums General Discussion Engines casting nmber help

i have a rolling chassis they said it was a 63 chevy lwb. well it is a lwb but i do not think it is orginal engine the casting numbers are has follows
8921968
gm
69
i called gm they said they have no record of this number, and also said the 8 should be a 3 for 1st number i checked it is a 8 also the number on the heads are as follows
2084f49
gm
its is a inline 6 it has two inspections plates on passeneger side of block, disperator is in front
any help or ideas how to find the engine size would be very helpful
i saw that yall helped people in this area before hoping you can help me

In the "Power Manual" doesn't list that casting number. It does list "3921968" as a 1966-70 Car 230, and as a 1962-79 Truck 250. If that's the original engine then it should be a 250. Hope this helps. John

What's the stamped code just behind the distributor?
Pull the plugs and look at the top of a piston. Usually, if its a flat top, then its a 230, if its dished, then a 250.