Your about 180° off. if your looking for low end tourqe and grunt you gotta work torwards in a different attitude. You actually need a less agressive small cam. Peak tourqe usually occurs near your highest volumetric efficency. You run the bigger cam your putting more air into the motor. At lower speeds the air charge speed is going to be slower because the demands of the engine are not near as great, but at the higher speeds you effectively fill the cylinders, but low end tourqe suffers. If you wanna make the truck truly fast your will disregard low end tourqe, grab the biggest longest duration cam you can find, port (in all actuallity hog out) the head, put huge valves in it, a completely free exhaust with a tuned header, and either a wild stall converter (4500-5000 rpm). This way you will gain the most horsepower because your making a gob of tourqe at wild rpms. This won't be a streetable combo in the pure sense, but boy it would smoke tires and run.
For this motor I'd reccomend getting a truck camshaft, that will help fill the cylinders from 1500-4000 rpms. Run either a stick shift or a slightly stalled automatic. 4.11 gears will greatly multiply the tourqe and you'll be able to have enough tourqe to pull a barn. But don't scimp out and get the smallest camshaft you can find. When you improve the induction exhaust and the head your are going to need to move more air into the motor, more than the factory camshaft will allow at the RPM the altered parts will let you.
The goal is to rather build a RPM to shoot for. Right now the motor is pretty much built for tourqe at off idle, basically your want to slightly elevate this, and get the VE (volumetric efficency) to around 100%, instead of the stock ~70%.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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