I would have to guess that your heads are in the 165-175 cc range, stock is 150-152 cc's with a 1.88 valve and with a 2.02 your more than likely larger than 175 cc's. The most I have ever cc'd with a 1.88 fully ported is 168 cc's and 187 cc's with a 2.02. The stock W-2 is 184 cc's from mopar which is large for most any small block and more suited for racing, with small block mopars. For comparision a big block dodge 452 head cc's at 180 cc's and max wedge heads at 210 cc's (from the factory) and these are for big blocks. A early 318 head cc's at 120 and the 302 heads are 115-118 due to pushrod pinch area being smaller. Generally to get 260-270 cfm's from a small block factory head they have to be ported a good bit, as from the factory they only flow from 205 -215 cfm's this is what I based my assumption on.