While I'm having my 70 freshened, I am looking into the possibility of going larger. A BB76Q is what I have my sights on, but I'm not sure if this may be too large for a small CI motor ( .020 over 109 ). I have ported GN1's, ect, and had no problem spooling the 70 on the foot brake w/ a rated 3,600 stall conv ( actually atalls at 3,800 ). Any thoughts? Anyone used this turbo with a 109? Brian