Well, I can see why they would shun people who do engine swaps...look how the 356/911/914 purists treat us 924/928/944/968 guys.

The 3.0L you speak of only came in the 968. The 944 and 951's used 2.5 and 2.7L engines. And the explaination is simple really. In 1985, what was the average power out-put of other 4 cylinder engines? I bet the 944 was right on top.