Which turbo to go with

[Rell87]

I just got finished with my new motor for my 1987 Grand National and I'm not satisfied with my turbo. (PT GTQ70) I'm thinking about going with a BB turbo but I can't make my mind up on which to go with a 74mm or 76mm. Check out my ride a give me some feed back on which u think would be better. (90% street driven) Cardomain.com/ride/2308509