My 364.5 fmw I ordered thru works turbochargers.
It started out a box 362 fmw, they machined the comp housing and put the 64.5 wheel in it.
It's got the 68mm turbine with the 1.00 a/r housing.
I'm having same results as most on this forum who are running the basb from bell.
It spools fast and I can lug the truck on a hard pull down to 1500 rpm and still stay under 1200 egts. Couldn't do that before with my s366.
I can cruise pulling 10,000 lbs nicely at 10 psi boost 1800 rpm with egts around 1000.
My 366 would be at 1200 almost all the time.
Overall it cost me about the same as a bell turbo but I got it built in a week.