What are you doing with the car?Is it drag only or street/strip?You can get 80mm for under $1100.I have a couple of 76mm Holsets off 855 Cummins.It has alot to do with the hp you are trying to get out of it.Diesel turbos are a good option,but most have larger turbines so they won't spool as fast.I have some good sources on buy turbos if you need some.
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1964 Impala 468BBC,T350 transbrake,4.30 9",10 point and 10.5 M/T's
1996 F250 4X4 12V Cummins,compound turbo 63mm over 75mm,cam,520cc pump,full billet 4R100 563hp&936ft.lbs w/a bad fuel pump and on a dynojet...just an old hunting truck 
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