how to adjust for new intake manifold on older ecm

i've swapped from truck intake to ls1 intake to clear hood on 68 camaro with engine from 04 buick rainer. new ecm's have a setting for engine > airflow > speed density > dynamic airflow > manifold volume. i have no setting for manifold volume. are there alternatives to adjust for a new intake

You have to redo the MAF airflow curve and the VE table for the change in intake manifold. There is no "change this or that" and bingo it's all done.

The low end and higher rpm will need a once over to make sure fueling is correct.