Are you wanting to R154 swap your is300, this is a great video to get started. I list everything that you need to swap, as well as where to get them from. Sorry for the lack of video quality, I am at my school and really wanted to get a video out to you.
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Parts from video:

R154: Can be sourced from facebook Marketplace/ any other market place or Driftmotion
https://www.driftmotion.com/New-R154-...

R154 MC Rebuild:
https://www.driftmotion.com/product-p...

Drive Shaft:
https://www.tf-works.com/driveshaft-s...
or Excessive
https://www.xcessivemanufacturing.com...

Trans Crossmember:
https://www.ebay.com/itm/IS300-GS300-...

Crossmember Creator:
insta @1jayzed

Poly Mount:
https://www.xcessivemanufacturing.com...

Clutch Kit:
Stage 1 *I did track days on this with ge*:
https://www.driftmotion.com/Stage-1-C...

Stage 4 *I'm listing this incase you want to turbo and track*(Drift/track):
https://www.driftmotion.com/Driftmoti...

Flywheel:
Normal weight (Can find on facebook groups):
https://www.driftmotion.com/1JZ-GTE-D...
Lightened:
https://www.driftmotion.com/Driftmoti...

Clutch pedal w/ Master:
https://www.xcessivemanufacturing.com...

Cube Speed Shifter:
https://www.ebay.com/itm/CUBE-Speed-S...

*Rebuild if you need one*:
Find local shop

Slave cylinder:
https://www.driftmotion.com/Clutch-Sl...

Clutch Line:
https://www.driftmotion.com/ProductDe...

Clutch Fork:
https://www.driftmotion.com/Clutch-Fo...

Trans Fluid:
https://www.amazon.com/Red-Line-50205...

Clutch fluid:
Autozone/O'Riellys

Pilot Bearing:
https://www.driftmotion.com/ProductDe...

Pressure plate Bolts:
https://www.driftmotion.com/Driftmoti...

Flywheel Bolts:
https://www.driftmotion.com/ARP-1JZ-2...

If I am missing anything, or you need help message me here or on Instagram and I would be happy to help you :D

Social Media:
Instagram: 1j_Hugi