Upthrust will make an airplane climb.

Things to consider:

If the airplane's design calls for zero thrust or possibly down thrust, and your plane has up thrust, when we say "the airplane will climb", this "climb" will be fairly drastic whenever full power is applied. Almost like you are beginning to perform a loop.

What thrust does your airplane call for? This is important to know.

Most planes, after properly constructed and trimmed for straight and level flight, will actually climb slightly when you are making a full speed pass. We are talking a very shallow climb here, perhaps only several feet higher in altitude over the entire length of the field. This is normal.

Pattern aircraft, scale, and other special designs can act in different ways also.

I am no expert for sure. This is just what I have found out from sport flying.

Quick basic check:
( The plans will identify if the horizontal stabilizer has any positive or negative incidence, or degrees tilted up or down in respect to the centerline of the fuselage )

With incidence, if any, factored in:

Level your horizontal stabilizer using a small bubble level. Then place the level against your engines mounting flange. What you see...is what it is!