Installing small block from the bottom

I understand the process for installing the headers. (And reviewed Jeg's instructions when the fit problem became evident) The point is that with the centerlink installed on the pitman arm, there is not enough clearance to bolt up the header. In lifting the header back in place, the top of the header tubes contacts the bottom of the center link before it gets to the place where it can be bolted up. So either the pitman arm is not going on all the way, or the engine is too high. This is "supposedly" a correct 73 gearbox and a correct 73 pitman arm. The only other variable I can think of (which occurred to me yesterday) is that the K-member is a slant 6 K-member modified with a Schumacher kit. I have written to Mike at Schumacher and will also re-measure that mount today and compare the installed height on the engine with what it would have been on the V8 K-member. The original was bent, but I still have it in the shop.