if using the original water pipe routing then the 1 above the bell housing will foul the bulkhead, and the distributor, so best to convert to coilpack management and blank the distributor hole, the water pipes are easy enough to relocate etc,
the exhaust manifold will need a fair bit of adapting but if your handy with a welder then its just a bit of time cutting and welding,
either that or just buy 1 for an escort and use that, they are available straight off the shelf,
not sure about sump clearance on a sierra but it needs changed to go in an old escort so you might have to adapt that or use a manta sump and pick up pipe