This thread makes me LoL.

wtf does 20psi mean? how much a power a stock motor can take depends on the HP, not the psi. 20 psi from a 14b and 20psi from T3/T4 are going to make different numbers.

Just so you know 350 hp setups are common for stock turbocharged H22's that have been properly put together and tuned. You will be fine with the stock tranny, just work with you have & build it and tune it right.