Not sure on B-body tti's? But im putting 2" A-body tti's on my 79 stepside. I'm working on putting a 440 in a buddy's truck and did a trial fit. Pass side fit like it was made for it. Driver side will require a little work. I will have to move proportioning valve rearward some and do a little grinding on the top of the frame rail. Then im sure it will go in.