ok 800 hp 350 seems a long way off. just was reading car craft today, they used a stock bottom end 350 domed pistons dart 215 cc small chamber heads,comp cam and were able to squeeze over 500 hp at 6800 rpm.
pretty strong but screaming . i dont know how long the bottom end would last at that rate. the same motor put out 497 at 6000 and 424 at 5000 down to 312 hp at 3000
not exactly a street friendly kind of engine lots of compression.
you can only get so much out of 350 cubic inches.