choosing correct ECU

[90htchbck]

yeah, i'm in the process of purchasing a 96 integra gsr with a b20 swap and 5spd, what is the correct ecu to use??? how do i make sure it's the right one...would P75 work??? what other ecu's will work???
also...
how do i identify which tranny he has??? he says he doesn't know what tranny it is

 

[AHHVTEC]

what kind of head is on it and what year

 

[90htchbck]

i think it's a 2000 long block, just the stock b20 head

 

[AHHVTEC]

the p75 should be fine but im not 100% sure