I found a used Turbonetics 62-1 63mm T4, with an upgraded stage 5 turbine wheel, for $500....is this close, or good to use? this is all the info I have on it right now.
Sounds like a good size for you.
What is the A/R on the turbine housing?
A smaller stage 3 turbine wheel will spool like crazy & will be a big restriction on your 250. Stage 5 turbine wheel is larger & will breath better.
Mine is a T3/T4 hybrid 62-1 Turbonetics turbo. stage 5 turbine wheel & have a .63 & .84 turbine housings.
Good for 625 HP on a 250 engine.
When you have a properly sized wastegate & a good boost controller, it will give you what you set you boost to.
MBHD