Me and little brother ready to do battle

Anxious to see what his car runs tomorrow. He copied everything i have on my motor..cam, heads, intake, convertor, etc
Except its a stock shortblock 71 340. Hoping it runs good for him. First outing. Test and tune got rained out tonight, 1/8 mile race tomorrow, no 1/4 like it would have been tonight. Was hoping it would run 11.70-80’s in bad air