True, the Buick is a great choice, if you can find one. They are light and they have a lot of torque for their displacement. But they will be harder to source than a SBC and they will be more expensive to rebuild or repair. Certainly the Buick outclasses the Gen I 350 Chevys from its era. However, I would guess that a Gen II with aluminum heads or the aluminum block Gen III will be as light or lighter than the Buick, and with its native EFI make as much power and torque as the 40 year old Buicks. With better economy.
But I'm with you if you want the Buick.
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D