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the fuel line is well away from any hot spot but it does tuck in the front below the alternator and sneaks in between the distributor and head. i have rerouted it twice in an effort to keep it away from the block and the head.

i have not tried a one inch spacer. i was considering a heat sheild/spacer set up like this:

http://www.summitracing.com/parts/MRG-3710/

but then i saw this valley pan and got to thinking:
http://www.summitracing.com/parts/FEL-1215/

i would use it without the paper gaskets.

i got rid of my off-idle stumble by using stiffer rod springs and a little richer on both stepups on the rods. it would be nice to lean it out a little as the plugs read rich.

Ben



I tried tuning out the off idle stumble with the metering rods and springs, ect...my jetting was spot on, but it just had this tiny little stumble that would not go away with my taller tires on it was noticeable (28" tall and 3.23 gear) with stock magnums the stumble was gone...
anyways back on topic, your fuel line routing sounds stock...that's should be ok....do you have the exhaust heat ports blocked in the manifold? that can cause it to run a little hotter...but honestly i was almost ready to accept the problem until i saw the 1" spacer kinda like this one: http://www.summitracing.com/parts/EDL-8711/
but with the removable center...that really did it for me, absolutely no problem at all no matter how hot it is outside....
i would try the spacer first, it's really easy to install and since you have a truck it should not give you hood clearance issues like i had; i had to use a drop base to clear the hood...also my heat crossover ports are blocked....almost considered a must with after market intake i would think?