7-8 psi is nothing for BT.
And building it completely with forged Pistons must cost you around 80-1lacs nearly. Titanium valve seats, porting, gasket mls for low compression, bigger trumpets, aem or walbro pump 375lph, injectors, emu or aem ecm and few more stuff and likewise this turbo job will cost you nearly 2lacs.
But i would recommend, if you wanna keep it for daily driven need as well never build it. Built setups don't have much life. Moreover building It in 1lac budget would be some real fun.