Engine Block Casting Number

[cwilkie]

I'm trying to ID my engine so I can get the correct heads and intake for it. On the block the numbers are really hard to see but this is what I have deciphered.

105002?YR 60270245

The question mark is for something which looks like a "T" or "7".

Currently I have 454 heads on my 396 and I would like to make it all 396 in hoping it will give the engine a little more snap.

Please let me know if any of you can help me. By the way, I decided to go with a 700R4 "God Father" transmission from Mad Dog Transmissions for those of you who remember my last post.