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If you're going to stay below 3000 rpm keep the peanut port heads. They make better low end torque than oval or square port heads. Get a good "tow" cam . Don't go radical with duration and lift. Increased port size, duration, lift and decreased lobe separation angel = higher rpm to get the benefit and will be counter productive to what you say your use will be....jm2c'sPhysically it will bolt right in with a change of motor mounts.
I would avoid a Gen V 454 (1991-1995) and look for a Mark VI 454 instead. The Gen V has many small differences from the mark IV making many parts incompatible between generations, this combined with a smaller aftermarket selection for the Gen V make the Mark IV a superior choice for building or upgrading in my opinion.http://www.superchevy.com/how-to/4567-chevrolet-big-block-engine-generations/
whoops just realized i wrote to look for a gen VI (6) when i meant a Mark IV (4). The Mark IVs are quite common (made from 1965-1990 from what i understand) and from 87-90 they were available with TBI, sorry about that mix up.
IMHO a 110 LSA will give you a lumpy idle and a lumpy idle sounds awesome but just means your gas mileage and torque is suffering at lower rpms.