turbo 6 bangers post here

I have a 64 Dart GT 225 factory 4 speed. Engine build, bottom end stock bore cam, Head is an 1986 shaved 60 under, the big 1.70/1.43 valves. Stock super six intake with a Holley 650.
I am going to try turbo low boost 7-10 lbs.
My question 1 is I see turbos with internal bov set at 7 to 10lbs. Or the adjustable external bov. What if any would be the cheaper route. This is no means a race car, just want more giddy gone. The plumbing I understand,just need ideas on what types of turbos would be easily obtainable for my small needs. I don't think I'll have a problem with lean burn with the big carb. Car runs good as is, but needs more air.
Thanks in advance for any ideas.