If you want great torque from off-idle to highway cruising, then forget about HP. Look at the International Harverster V-8's, used in school buses and dump trucks. HP is blah, but they can pull HEAVY loads from a dead stop with no problem. They used reversed split, exhaust about 10 degrees smaller than the intake duration. Something like the old Comp 260 would probably work very well for what you are talking about.
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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