Thats a good point, Matt. When I ran the numbers based on the ITACs accepted HP for the RX-7 to see how it would sit in B, I thought, "Holy lead, Batman!".
EASY decision that B was a BAD idea.

An easy way to visualize how much the weight added to a car is is to imagine the number of cinder blocks you'd have to load into it. IIRC, moving the RX-7 to ITB meant that I'd have to load over EIGHT blocks into my car AND ditch the 9 lb wheels I'd worked years on to get to seal and balance, and dump 3 other sets of wheels and tires....
...and find all NEW sets of wheels and tires....in an inch narrower size. AND re-set the car up for the increased weight, and the reduced rim width. Yea, it was going to do GREAT in iTB!

That really didn't hold much appeal......

Too little, too late.