So im thinking 2small blocks 383'400'454's putting out 550-600 hp per side on xr drives. should get the new bottom well over 100 !!!

Gary,
The setup you have now is about as good as it gets in a Y2k. You know the boat in and out and it's best setup with a single.

If you want to go real fast buy/build a 32-36ft twin engine CAT.

I wonder how many orders JC would need to build a new and or strech the y2k for a big block twin.

Pat your probably correct, However I do like to think out loud !!!!

CAT's are nice but there is nothing like seeing a V hauling A$$$

I was thinking side by side 600's

It might be OK if you build all aluminum engines to keep the weight down.
That Y2K with the twin 6.2s used to be kept on a canal close to my wife's cousin on the south shore. That boat sits real low in the water.

I wonder how a short stagger would work ???

Na... you'd loose the back seat. I think we've gone around on this one before.
Gary, if you want a 100+mph Y2K, swap your drive for a Konrad or a Speedmaster and bolt on a blower...
Boating season must be over now that the wild dreams are spilling out...

I'm look'in for a 28-30 cat with outboards!!