I dont think i cant put a sig being an "enthusiast". anyways I have a '92 with a Inline pump, #4 plate, 4K spring, mack rack plug, 5x14 injectors, 18* of timing and a hx35/40. I dont know what the limit on hot is, im not willing to take it past 13 intentionally. It climbs very fast so im sure it will keep going.

Is the truck intercooled or not?

intake and exhaust may help a little. as far as water/meth, better have some good head bolts before going that route.

It is intercooled. I have ARP studs with a ringed head.

1300 is not that hot but you will need more charger than a 40 if you want to stay in the fuel pulling a trailer. I would run a touch bigger. Something like a 63/68-13s would work like a champ.

I just got this turbo, so i would like to run it for awhile. Any other help?

Heard good things about the 63/68/13

Id like to stay with the 35/40 since it is pretty new. Any other help?

less fuel or more air. thats pretty well your options unless you go with a water/meth kit.

I agree. The 5x.014's are a tad bit big for the 35/40, really with an agressive plate they're even a bit big for a 62mm turbo.