SBChevy Block #'s any help

Hello, from a newbe, joined last nite....
Introduction is in order, presently I drive my 1941 1/2 ton hot rod daily.
powered by an early Corvette 327 / mild cam/ turbo 350/ camaro clip,.
totally fun....
I good budy of mine has offered me a SBC, 190 ( ? ) heads, and all the lower end pistons, etc.

Block has these #'s
GM # 3 8 4 9 8 5 2 ( first # could be 8 ) casting overlap prevents clear ID.

Back of Block
H 8 ----8 5 2
8 7 0

Front of head
F C 6 2 2 D
thanks , great site..
Bitoman

D suffix, 2 date code, 3 8 4 9 8 5 2 casting:

1962 year 283 c.i. engine for powerglide.

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