What engine combo do I have?

Here are all the numbers I found

Engine
14016379 ,It is a 4 bolt main

Pistons
Says B552 under and says 30 over, All I know is they kinda look like this.
http://cgi.ebay.com/ebaymotors/dynag...ayphotohosting
http://store.summitracing.com/defaul...7&autoview=sku Page4, 3rd one down.

Crank # 3941182, I believe its Forged

Heads
354434 ?

Felpro gasket
7733PT2

GM Hot Cam

What kind of combo do I have. What kind of HP do you think it will make? Whats the compression. I was thinking of putting in a Comp cam 270H in it. I looked up the heads and they look REAL small.
Thanks

The block is a 1978-85 350 c.i.

You're right, the crank appears to be a GM forged crank.

The heads appear to be 1975-76 305 c.i. 62cc 1.72" intake/1.5" exh.

The heads appear to have been installed to boost the compression ratio, but they aren't going to flow enough to support that 270H cam or a 268 cam for that matter. I'd change the heads to something that would flow more volume if you are planning to use that cam.