Don't get a shitty oil filter, fill it up with one (1) extra quart of oil in it, it's completely safe and highly recommended with engine as it will get rod knock wicked quick if the bearings don't see oil for a split second. The supra will naturally burn about half a quart of oil every 3000...
The cam caps had a layer of soft babit-like material on them when new. This wears down over time. Light scoring is normal, check the tolerances per TSRM spec to see if everything is still in tolerable ranges. If not, you will have to have them resized most likely.
Rodknock also kills these...
Most of the head swapping going on with v-8's were on carb'd setups, where the electronics in the car very few and far between as far as stuff connected to the actual motor. Back in the days anyways...
A 1.5JZ is a 1JZ period. The stamp on the block doesn't mean shit. All the 1JZ electronics (IE HEAD) are on the motor, so it's a 1JZ. If you somehow put a 2JZ head on a 1JZ block, it'd be a 2JZ as the heart and soul (ECU) would be from the 2JZ to make all the electronics work.
I ran over a racoon late one night in my old 2G elcipse. I was cruising down a back raod, maybe 25-30. The fucker runs out right in front of me all squirrel like and I hit his ass dead on, right in the middle of my front bumper, gotta love urethane ;)
I heard the THUD BATHUMPA BUMP A BUMP and...
Eh, I just think we should see ONE piston first off and have it mocked up in a block with a head buttoned on, maybe put some clay down in the cylinder and rotate the thing 360* to see if there's any interferance, or how close the valves make it down to the piston, etc. You get the idea. ;)
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