I run a airtec in my saff at around 370 bhp on a t34/48 with intake temps about 26 degrees that was on tuesday running 30psi.

My mk3 cortina was running a 4x4.cossie cooler due to space restrictions at around 360 on greys with no noticeable high act's as seen on the secs monitor.

Tbh what u have will be fine and as Mark's suggested make sure the air flow goes thru cooler.and not around the sides.

Paul