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im not looking for a high revving motor. I need a motor for crusing in, and i've already had everything checked on it. My exhaust finnaly fell off (whole 8 feet after the catalytic converter) so i ripped it out and drive it with the pointed peice out of the back of the converter. It now can do a U-turn where it wouldnt before (some help from spinning the tires). But it still doesnt have what it takes at the low end to move this car from stop signs and up hills.

What i meant about the THM400, i didnt think it would hold out to a supercharged 500cid with nitrous. I will unhook the catalytic converter when i repair the exhaust, and see if that helps the bottom end.

How would further advancing the timing help? im running 18DBTDC, and with vaccume advace it should be at least 22-24 degrees. The whole engine looks like it will jump out of its engine mounts from the timing. And it does drive more sluggish with less advance.