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Yes the casting numbers are the same 340 or 360. The 1.88 intake valve isn't a big problem and who knows maybe someone put some 340 heads on a 360,no big deal. Look at the block,the year and cid should be on it.

340/360 used the same head castings after the 360's were introduced. That is like saying that 'my 383 has 440 heads'. The earlier 340 X head casting wasn't that much different that it would make a difference. the 2.02 valves will not be a help unless you are spinning in excess of 6000, in fact the 1.88 valve heads may in fact have better low end.