You should consider doing a 4G63 swap. You can get longblocks for real cheap, and they are pre-built for boost! I would even venture to say the 1G 6-bolts are pre-built for 'ass loads' of boost, with their low-ass compression: 7.8:1 !
'Big Bore' kits usually work well for bigger motors, since going .040 over on 8 cylinders of a 5.7L will yield a lot more displacement than going .40 over on a 4-cyl 2.0L. Might wanna do the math and see how much it'd be worth
