I have the Trick Flow TFS-2500100 Spring Upgrade Kit installed for my GT40P heads.
https://www.summitracing.com/parts/tfs-2500100
Will the XE 256H have better Torque than the XE 262H? Under the notes for the XE 256 it says "Strong Torque through low end". I'm still undecided between the two.
As others have mentioned it all comes back to your combination of parts and driving styles. Tire size, Gearing, 1st gear and highway cruise gearing, intended uses, auto vs standard, carb, intake, exhaust, manifold or header type all come into play and could work with or against your cam choice. Once you have a cam then you need to check valvetrain compatibility.
I agree with Master Chief on bigger isnt always better especially when we run heavier tires and drivetrain parts than what most of the industry is used too. I run a 1.12 4100 carb (500cfm) 9.6 comp ratio, wieand intake, full roller scorpion rockers, Gt40 3 bar heads with springs and upgraded keepers to match cam, scat 347 rotating assembly, bc shorty headers, 2 into 1 2.5" exhaust with 22" magnaflow muffler. 4.11 gears m5r2 trans and 30" tires. My cam is a 35-349-8 which most would consider mild in a 347. It works well much better with 4.11s. It has a very stock sounding 750 rpm idle but surprises the hell out of people even dipping halfway into the throttle.
I have considered 32 inch tires which have me thinking the 258 grind could have been better for a little more down low and avoiding another gear change later.
Think about what you have and where you are going. Do you like cruising down a back road at 2200 rpm or 3200 rpm to keep engine near peak torque and efficient based on cam rpm range? Will you go off road? Make sure you let comp know your preferences and uses as well for their input and remind them of tire size and weight
It's not an easy choice but take max power out of equation and think about parts u have/will have and your preferences.
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