turbo size

[CamaroAJ]

so i ordered my turbos a few months ago and the guy at forced inductions said that 2 T04E turbos will support upto 1000 horse on a 421 small block chevy. so i got them out of the box the other day and noticed a A/R .50 on the compressor housing. i'm wondering if these are the right size, the compressor is .50 A/R, the turbine is .68.
there on master powers web site http://www.masterpower.com.br/eng_framese

810011 TO4E TURBO EX. HIGH-PERFORMANCE TO E.U.A
EX: TO4 64 RT: TA 58,16 MONOFLUXO INLET T4
TURBINE .68 OPEN, COMPRESSOR .50 VOLUTE



i have a feeling there not the correct size for what i want, i'm looking for around 1000 horse when its cranked up but will be keept around 500-700 horse most of the time. what do you guys think?