hi if any one can help that will be top

ive got 205 block which i want to put 1mm oversize 4x4 new piston which i have already in, i will be using a standard head normal group a head gasket etc etc.

i want to run t3 300bhp @21psi or t34 330bhp @24psi

do i need to tell the machine shop to lower the comp on the pistons or will they be fine or if someone knows what comp ratio to use then i can tell the machine, if you get where im going from.

i know 1mm pistons arnt a good idear for big power i just need to put an engine to gether while i finish my big power engine.

many thanks steve