1UZ VVTI S13 Drift Car

Hello, I am currently in the planning phase for a 1UZ swap into my S13 drift car. I am searching for feedback as far the overall swap goes. I want to minimize things I am missing and things I haven't considered. I have what I consider to be a fairly comprehensive list of parts chosen, as well as maintenance items. Attached is the bill of materials with said parts specified. Also attached is a rough draft of the wiring harness and system routing.

To go into more detail regarding the swap I have a 98 1Uz vvti, and it came from a car that had an AR5 hooked up to it. The previous owner had done some less than ideal harness work, and I figured instead of fixing a 30 year old harness to still be on a stock ECU, I might as well go standalone. I found what is essentially the cheapest sequential V8 standalone I could find with the SPTronics EMS800x. It's a megasquirt processor and runs tuner studio. It has all I/O capabilities I need for this swap once I select the dual wideband controller and a VR signal conditioner so I can have dual cam closed loop vvti control. I would love input regarding vvti tuning and the ACIS tuning if anyone has done it. I am comfortable in my tuning knowledge having tuned a handful of cars at this point thanks to HPA, but none of them have had vvti or a variable runner length. Without a dyno what is the best way to tune these systems? Is there stock vvti calibration readily available for MS3 software?

I will use the oem KA trans which will be bolted to the uz with a Collins adapter kit. I will also be getting the flywheel, 6 puck sprung clutch, engine mounts, and release bearing from them. If anybody has run this kit and has any advice as far as install goes that would be awesome. On the website it says you might need to grind down the starter teeth to get better engagement, but someone who did a non vvti swap that I talked to said they didn't need to do this. But they also said the started hit the bellhousing and they had to grind that down, which Collins doesn't mention at all. Has anyone that's done this swap ran into any issues with starter engagement or had to file down the teeth?

Steering column clearance is another one of my concerns. I know they don't clear, and have selected pieces to replicate the XAT racing header kit. The kit was designed as a diy kit knowing you would have to modify around the steering column. It lists each piece they provide and I found those on other sites, so I should have everything I need to modify the set of 2UZ tundra headers I have selected. Despite this I am worried about sacrificing cylinder scavenging and overall flow. Are there good rules of thumb to keep in mind when modifying? This doesn't need to make every ounce of power available, but I would like to set it up around good principles.

As the parts suggest I plan on doing a decent refresh of the engine. I plan on buying a master seal kit, as well as a timing and water pump kit. Is there anything else I should be aware of on these engines? Any other preventative maintenance you would recommend?

I know this is a broad topic and I don't have an exact problem right now, but in my opinion nothing beats talking to people that have done this before. I know there are things I will forget and things that will pop up out of nowhere, but I am hoping some of the people who have already done that can chime in. If you've read this far I seriously appreciate you!