A supercharged 598 would have made that kind of HP way cheaper.

we run 598s with dart big chiefs and blowers a good combo

I ran the CNC Brodix 1801 after BB2xtra, same blower, same boost, 598, picked up 5 mph. Intake runners were 388 cc.

Nice--- what RPM?
....And Do the Big Chief heads come in different/various CC runner sizes?---- or do they only come in ONE Size.
Also with what Intake valve size and are they 20° or 18° head or what ❓❓❓

What kind of Power are you seeing on the Dyno?

Is it possible these days to make 1400+hp with a 705cid BBC Super Tall Deck Height block of 11.625" with a 510 Whipple supercharger, Whipple's Father Of All Coolers, and Conventional 18° head with a one piece shaft mount killer valve train system setup, 10-lbs of Boost and make 1400+hp @ about 6000-6200rpm for a Marine Offshore package and stii have good endurance longevity ❓----- without having to rebuild the bottom end until about 400-hours❓❓❓
Or is the rod angle/ratio too severe with 5.250" Stroke ❓
What do you guys think?

The dyno testing was back in 2004 and 2006, the BB2 Xtras made 1372 HP @ 6200, 1188 Torque @ 4400 at 15 psi if memory serves me correctly. The Big Dukes were making 1325 HP @ 5000 when exhaust pushrods bent and broke lifters. I never got a good pull, Trend speced the pushrods. The shop needed the dyno before I could get new parts, I didn't want to spend another 600.