The SPA manifold you can buy from mrhotrod6@bellsouth.net
I have a T3/T4 Turbonetics hybrid turbo 62-1 rated for 600-625 HP,it's old,so maybe Turbonetics makes T3/T4 hybrids good for more power?
T-25 adapter would really choke it.
A GT35 will will great.,IIRC,,they make a 1.something A/R on the turbine housing,thats too large for an everyday driver w/low stall converter. Poor boost responce,laggy.
A turbonetics turbo with following specs approx,
A 60-1 High five Compressor wheel,.70 compressor housing
A T3/T4 turbo will work. .63 A/R on the turbine housing approx stall 2400 RPM)up to .84(that would need a higher stall min 2800)
The 250 will respond well to boost as will most engines,but more so because of poor cyl head design.Siamessed port.
Hope this helps a bit.
Welcome aboard!
MBHD
