Acceptable HEAT RISE number for this 20-yr. old furnace.

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Intertherm Model: MGHA-077ABFC-05
Serial Number: MGH9703-05880

Data label: Nominal Air Temp Rise = 70°F

Current heat rise = 38°F, but hoping to improve that soon after getting the OUT PRESS port plug removed from the gas valve (having trouble with that currently), so the manifold pressure can be adjusted.

Can anyone tell me what would be an acceptable Heat Rise number or range for this older home and furnace (home and furnace are both 20-yrs. old.
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