Denny,
I haven't had the hatch off yet but I'm willing to bet the tank is original. I'm sure it has baffles but she definitely sloshes. Another point is, our hatch goes all the way from engine box to the step down, instead of half way like most others, in order to accept the 100 gal tank. I think the twin 50's are a better option for controlling the forward weight.
Gerry,
Although he hasn't posted in quite some time, forum member Ken Kurek has a 454 in his 25. You could try shooting him a PM for some more info on the big block.
Brandon
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