t3/t04b will give u enough power to get to 350 if it is a 72 trim.
im not really a turbo scientist at calculating these numbers but i didnt think u could fit a .48 a/r onto a .72 trim wheel. where are u buying it from?
the best size turbo for our b18’s is a t3/t04e 60/63, this turbo is capable of 450 whp and ive seen it do it. the t04b’s usually have a smaller max power for the t04e’s (not sure why)