318 into a 340

From Allpar:

"The A block was fractionally bigger in external dimensions than the LA block, although it was heavier due to the new casting techniques. The LA block 273 weighed 55 pounds less than the poly 318, both used 4.46" bore centres, and both were 21.4" in length, without water pump, crankshaft, etc. The poly heads are much wider and heavier than the LA's wedge heads and that gives the A block engines the appearance of being bigger than the LA engines."

Here's more:

http://www.allpar.com/mopar/poly.html

Is this why you think it has 2.02 heads?