Adjust formula to allow for changing sheet reference.

I was using the formula below which was working fine for copying across 20 columns and down however many rows, but now the requirements have changed to 90 columns. I have tested this out with the 90 columns but the Indirect function is bogging down the spreadsheet with the constant recalculating.

=IFERROR(INDIRECT("'"&COLUMNS($A$1:A$1)&"'!P"&ROWS($A$1:$A8)),"")

I rearranged the formula to the one below, but how can I have the reference to the sheet name changed as in the formula above without using the Indirect?

=IFERROR(INDEX('1'!$A$8:$AT$115,MATCH($A3,'1'!$A$8:$A$115,0),MATCH("PAT",'1'!$A$7:$AT$7,0)),"")

The sheet reference will change from '1' through '90'.