Hello Ori. What Jim said, go to big block darts' site. iirc due to a stackup of tolerances BB manifolds may or may not fit on the DR side & if they do it will be real tight & not sure if shortening the col sleeve will always take care of that. On the pass side lose the heat riser & need an angle cut to tilt the outlet closer to the block. I'd read up on it & drop the eng in without ex man studs & go from there