I'm a big fan of the R33 brakes, I used the GTS-T booster and M/C along with front discs and calipers on my 240Z.
My engineer was similarly very impressed with the performance and feel. Needless to say I've checked to see if the R33 discs and calipers will work on the 240 Volvo .....and the won't due to offset issues.
Threads from my build: https://www.viczcar.com/forums/topic/9734-240z-manual-only-upgrade-to-skylinesilvia-booster-and-1516th-master-cylinder/
https://www.viczcar.com/forums/topic/13582-r33-gts-t-calipers-onto-a-240now-completed/
I bought some BA calipers and confirmed that they won't fit under 15 inch wheels so I'm now leaning towards RX7 front calipers and 740T discs. Anyone got some FC RX7 calipers for sale?