Hp Estimate, Opinions/advice?

Hello fellow members, just seeing if anyone has some estimates on what kind of power i'm making with my current setup. Any advice for changes are welcome, but i'm normally working on a smaller budget than most.

1984 Mustang GT 5 Speed
87 block and bottom end
Holley 600 vac. Sec.
Performer RPM intake
Gt40p heads w/ tfs springs
Anderson n-41 cam
BBK shorties
BBK 2 1/2" offroad into thrush welded
Underdrives
Electric fan
No p/s or a/c
 
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I've researched supercharger's, they are just out of my budget for the time being. My plan is to buy the efi twin turbo kit from ebay( yea i've seen the reviews and heard about the problems) and modify it to fit my application. Seems to be my only option for forced induction, plus its more time to tinker with my car.