Hey Dan
I was referring to the 218cc model. You make good points in that there are other excellent choices that would not be legal in competition. Here is some of the flow data on the three heads you mentioned. I've also averaged it which gives a much better picture of the head as opposed to peak
brodix bf300
0.200 152 122
0.300 214 166
0.400 265 195
0.500 300 213
0.600 325 220
0.700 331 225
avg 264.5 190.2
sum 454.7
chi 218cc
0.200 143 114
0.300 203 153
0.400 259 191
0.500 299 208
0.600 319 219
0.700 332 225
avg 259.2 185.0
sum 444.2
c302b (from super ford article)
0.200 156 129
0.300 224 169
0.400 278 200
0.500 306 223
0.600 335 245
0.700 358 256
avg 276.2 203.7
sum 479.8
Those c302 heads do flow super well and I've also heard that some people have them flowing into the 400s which is unbelieveable. I wanted to point out that the chi 218 and the brodix bf300 are very similar. The average flow rates are within 2%. I've heard from more than one source that the out of the box 218s flow bigger than advertised, often close to 340.
I think we need to compare apples to apples when talking about the C302 heads since many of these in the high 300s are heavily ported. Kaase's heavily ported CHis were near 370 peak (367 if I remember correctly).
There are many excellent heads for the Cleveland builder...I personally think the CHi 218 is a very good offering.