What is with the number 500, is that 5 more than your buddy. Looking for ideas of what vehicle you would like your truck to accelerate like can be more help at times. An impression made by a C5 vette, 5L mustang 5 spd, LS1, 440 mopar, 389 poncho, will get you building the novelest rwd's .
My pickup has a 85 305 qjet with Vortec 906 head swap. It out powers the stock 2wd 454 big ten powerhouse truck from that year. Same 3.73 gears and chassis. My 305 creams the stock 454s.
Big ten stock got 8.0 0-60 and 16.4 in the quarter mile run. 10city/14high mpg.
My 305 truck gets about 15.5+ in the run as it burries the 85mph speedometer. 15city/16 mpg at 65mph cruise control on. About the same acceleration as a stock 99 grand prix supercharged .