If I was you, I would worry more about the condition of the shell.
Its easy and cheap to bolt in a new GA16 from a low mileage scrap car.
But its expensive and hard to make
extensive rust repairs etc.
You've also gotta take into consideration what effect that amount of miles may have done on the rest of the car..
Have the brakes been changed?
Tires good?
Any service history showing maintenance work such as CV boots, handbrake cables, clutches, wheel bearings, bushes? Anything which shows the car may have been kept well. Rust needs special consideration as corbs will tell you, his old SRi was pretty much drooping, snapped in half.
My personal car: 105k and burning oil.. Piston rings or valve stem oil seals. Engine mounts also went at 100k, causing gearbox problems. None of that deterred me because the shell I have has NO rust in the spare wheel well, seatbelt mounts, sills and front wings, there are two small patches on the back arches which are soon to be killed.
At the end of the day you can swap a new engine into the car in less than a day, and for probably around £150 from the right scrap yard