I've a 318 poly in my 40 Dodge with a rack & pinion, installed in 1973........I've also installed a couple of other V8's & steering boxes over the years in various mopars.........first thing is have you checked around as there are quite a few different exhaust manifold shapes & designs used on SBC engines over the years, however if the engine only needs to be offset 1" then depending on other clearances that still would be acceptable from an engineering standpoint although I understand your reluctance to accept that 1"...........as for cutting the steering shaft I've also done that years ago on a few cars.......the internal steering shaft is a hollow tube to allow the horn wire to escape, as for using uni joints so long as the ones you use are designed for steering use like Flaming River, Borgesson or Ididit or similar then they will be fine, the trick is deciding how to attach them to the cut column.........again that is a personal preference and thinking about this I would expect that you will need at least 2 if not 3 uni joints to get around the manifolds and therefore a center bearing to stop the shaft "flopping"..........what I did in my car is probably not real relevant as I mounted the Poly quite low and ended up using an Oz Austin 1800 rack & Pinion that I narrowed 9" & my car is RHD but thats technically not an issue............I've attached a couple of pics.........I'd get hold of a uni joint catalog before cutting anything as generally I'd think it would be better to identify uni joints that will work then cut the shaft to suit rather than cut & find that nothing will work..........lol.........anyway trust this gives you some food for thought...........any questions ...........ask away........Andy Douglas