Thanks for the replies. I was really hoping to avoid removing the intake manifold. I’ve tried to get it off before, after removing all the components in the way and all the fasteners I just could not get it to budge, even hitting it with a hammer and block of wood. I didn’t try the bottle jack persuasion method since I was finally able to get the oil filter head off ( with stuck on oil filter - a long story detailed in previous posts). The cam feed line suffered in the process though and now must be replaced.
I’m skeptical that removing the starter, and the soft and hard coolant pipes to the heater will give me the room I’ll need to install the new oil line ( I have a good used one coming from Everyday XJ), But having just had the fuel rail and water rail off earlier I hate going through all that again but if that’s what it takes so be it.
I’m also wondering if it might be feasible to cut the line somewhere strategic to aid installation and join it with a union of some sort, either a flared fitting ( I recently bought a flaring tool for brake lines on another car) or other style compression fitting suitable for the high oil pressure. Also wondering if I could cut and join with fuel injector line and good clamps, maybe after grooving the line so the tubing wouldn’t blow off due to pressure. I’d still have to be able to reach this junction. For sure it would be a bodge. You can see I’m very shy about going for the intake manifold again.