can someone tell me what these heads are?

Ive got 360 Im going to build up,, can anyone tell me what the heads are, 188 or 202 or J heads or what? the head number is 4027596... also, the block cast number is 4006830.. what year is this block? last one more question,, if these heads are not good performance heads, should I use 188s or 202s for horsepower and performance when i rebuild it??

thanks in advance.

christineman