The 416 heads are better than the 185's with smaller chambers you have more compression,since this is in a heavier truck your focus needs to be on torque at low and midrange,so what Edelbrock intake are you using? and have you changed camshafts? If your funds are limited we need to find the "best bang for the buck" that fits the budget.There is an old saying" Horsepower costs money,how fast do you want to go?"