badbug3

I have experimented with several motor combinations from all aluminum 526 keith black twin turbo bbc , blown 468 bbc, big nitrous 496, and now 572 ci bbc with one carb and nitrous on pump gas. I am very impressed with the torque and power of the pump gas 572 4.5 by 4.5 stroke motor i now have but i need more as usual. I wont ever run a blower again and twin turbos are just too damn expensive with efi and water jacket housinngs . What i want to know is what NA combination would make the most horsepower , still keep low end torque, ( have prop boat) be able to turn 7500 rpms occassionally without laying down on top end, and be reasonably low maintenance , run on av gas (max 11.5-1 comp) and not kill parts by running most weekends 2-3 hours a day? Prefer conventional heads for reliability also. Is it possible to make a 632 or so bbc run up to 7500 rpm's, still have low end torque without falling off too bad on the top end, and have a cam that the specs wouldn't be so big it would kill reliability? Total engine weight is a large concern so an all aluminum carbureted bic cubic inch engine would be my best bet from my testing on my particular boat. Im thinking if i could get around 900 or so hp on av gas, and get a long enough rod in a tall deck block, i would be just fine and keep the nitrous hit to small shot when needed if ever. What do you think?