If you wanted to run Stock, there are truck classes for factory trucks. Crate Motor Stock is also an option, using one of several IHRA-approved Crate motors. Both Stock Truck and Crate Motor Stock are for 1/2 ton or smaller trucks.
From the IHRA website:
http://www.ihra.com/competition/pistons.php Accepted Replacement Pistons
http://www.ihra.com/downloads/pdf/co...ateengines.pdf