Hi Jenny and welcome to here...

How much does the truck weigh? I was running low 13's (13.2s) with a hot 406 BBC (.540 lift ~220 duration, 10.2:1 compression) in a 3400lb car. Granted this is at altitude and would have run mid 12's at sea level.

I think your 350 will need a pretty agressive cam... probably solid lifter making power at least to 6000 (I'll let our resident sbc experts provide more specifics). How big are the tires? I'm thinking a 4.11:1 rear gear unless the tires are especially tall then 4.56:1(?)

3000+ stall converter. 700R4... might be pushing reliability.

How is the rear setup? Could be challenging to keep the power on the pavement.

Strip only or street/strip... pump premium or race gas?

Hard to get enough torque out of a 350 to start a truck moving quickly enough for low 13's....

Or.... you can always spray it

Two cents,

-Chris