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I understand that a smaller engine can produce more HP per CI, but I need HP and torque to get to the end quickly. Bigger engine should do that better, right?
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All other things equal, the answer is no.
It is HP per lb, that allows greater acceleration. If you were talking about just, top speed, like Bonneville or even, the standing mile, you might have a point.
The winner at the drag strip, is who gets there first and not the trap speed. Many races are lost, even though the the loosing cars trap speed is greater. The trap speed, is a indicator of actual HP.
In drag racing, the areas you need to work on are traction and using ALL the HP you have, just before getting to the line. That means gearing and gearing also, helps traction, it allows you to run a wider or, taller tire. So, you gear it to turn, slightly over your max rpm, at the line, in what ever the highest gear is, in the trans. Weight distribution, also will help, meaning not just the battery in the trunk but, everything mount as far back as you can get it.
If you just want to have fun, it doesn't make any difference. Just build your engine, to what you want and add the weight that it takes to stay in the class.